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https://github.com/rajeevranjancom/leetcode_python
Leetcode Python Solution. Those who Want to learn Python From Scratch check out the Website linked below. Good Luck.
https://github.com/rajeevranjancom/leetcode_python
competative-programming competitive-programming-contests leetcode-python leetcode-solutions pycharm pycharm-ide python2 python3 pytorch
Last synced: 1 day ago
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Leetcode Python Solution. Those who Want to learn Python From Scratch check out the Website linked below. Good Luck.
- Host: GitHub
- URL: https://github.com/rajeevranjancom/leetcode_python
- Owner: rajeevranjancom
- License: gpl-3.0
- Created: 2020-09-20T12:02:38.000Z (about 4 years ago)
- Default Branch: master
- Last Pushed: 2020-11-04T20:41:12.000Z (almost 4 years ago)
- Last Synced: 2024-09-26T06:04:14.429Z (1 day ago)
- Topics: competative-programming, competitive-programming-contests, leetcode-python, leetcode-solutions, pycharm, pycharm-ide, python2, python3, pytorch
- Language: Python
- Homepage: https://www.python.org/doc/
- Size: 1010 KB
- Stars: 3
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# leetcode_Python
# copyRight@Rajeev Ranjan
## Links:
| Websites |
|-----------------|
| https://www.python.org/doc/ (Documentation Releases by Version) |
| https://www.python.org/downloads/ (Download the latest source release)|
| https://docs.python.org/3/tutorial/ (The Python Tutorial) |
| https://www.python.org/about/gettingstarted/ (Python For Beginners)|
| https://docs.python.org/3/library/ (The Python Standard Library)|
| https://wiki.python.org/moin/PythonPeriodicals (PythonPeriodicals)|
| https://packaging.python.org/ (Python Packaging User Guide)|
| https://pyvideo.org/ (Python related videos)|
| https://docs.python.org/3/ (Python 3.8.6rc1 documentation)|
## Notes:
| Important |
|------------------|
| Python is an interpreted, high-level and general-purpose programming language. Created by Guido van Rossum and first released in 1991, Python's design philosophy emphasizes code readability with its notable use of significant whitespace. |
| Typing discipline: Duck, dynamic, gradual (since 3.5) |
| Designed by: Guido van Rossum |
| OS: Linux, macOS, Windows Vista (and newer) and more |
| Filename extensions: .py,.pyi,.pyc,.pyd,.pyo (prior to 3.5),.pyw,.pyz (since 3.5) |
## Table
| # | Title | Solution | Difficulty | Tag |
|-----|---------------- | --------------- | --------------- | -----|
| 1 | [Two Sum](https://leetcode.com/problems/two-sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/001.%20Two%20Sum.cpp) | Easy | Array / Hash Table |
| 2 | [Add Two Numbers](https://leetcode.com/problems/add-two-numbers/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/002.%20Add%20Two%20Numbers.cpp) | Medium | Linked List |
| 3 | [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/003.%20Longest%20Substring%20Without%20Repeating%20Characters.cpp) | Medium | Hash Table / Two Pointers |
| 4 | [Median of Two Sorted Arrays](https://leetcode.com/problems/median-of-two-sorted-arrays/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/004.%20Median%20of%20Two%20Sorted%20Arrays.cpp) | Hard | Array / Binary Search |
| 5 | [Longest Palindromic Substring](https://leetcode.com/problems/longest-palindromic-substring/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/005.%20Longest%20Palindromic%20Substring.cpp) | Medium | String |
| 6 | [ZigZag Conversion](https://leetcode.com/problems/zigzag-conversion/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/006.%20ZigZag%20Conversion.cpp) | Medium | String |
| 7 | [Reverse Integer](https://leetcode.com/problems/reverse-integer/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/007.%20Reverse%20Integer.cpp) | Easy | Math |
| 8 | [String to Integer (atoi)](https://leetcode.com/problems/string-to-integer-atoi/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/008.%20String%20to%20Integer%20(atoi).cpp) | Medium | String |
| 9 | [Palindrome Number](https://leetcode.com/problems/palindrome-number/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/009.%20Palindrome%20Number.cpp) | Easy | Math |
| 10 | [Regular Expression Matching](https://leetcode.com/problems/regular-expression-matching/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/010.%20Regular%20Expression%20Matching.cpp) | Hard | String / Dynamic Programming / Backtracking |
| 11 | [Container With Most Water](https://leetcode.com/problems/container-with-most-water/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/011.%20Container%20With%20Most%20Water.cpp) | Medium | Array / Two Pointers |
| 12 | [Integer to Roman](https://leetcode.com/problems/integer-to-roman/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/012.%20Integer%20to%20Roman.cpp) | Medium | String |
| 13 | [Roman to Integer](https://leetcode.com/problems/roman-to-integer/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/013.%20Roman%20to%20Integer.cpp) | Easy | String |
| 14 | [Longest Common Prefix](https://leetcode.com/problems/longest-common-prefix/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/014.%20Longest%20Common%20Prefix.cpp) | Easy | String |
| 15 | [3Sum](https://leetcode.com/problems/3sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/015.%203Sum.cpp) | Medium | Array / Two Pointers |
| 16 | [3Sum Closest](https://leetcode.com/problems/3sum-closest/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/016.%203Sum%20Closest.cpp) | Medium | Array / Two Pointers |
| 17 | [Letter Combinations of a Phone Number](https://leetcode.com/problems/letter-combinations-of-a-phone-number/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/017.%20Letter%20Combinations%20of%20a%20Phone%20Number.cpp) | Medium | Backtracking / String |
| 18 | [4Sum](https://leetcode.com/problems/4sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/018.%204Sum.cpp) | Medium | Array |
| 19 | [Remove Nth Node From End of List](https://leetcode.com/problems/remove-nth-node-from-end-of-list/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/019.%20Remove%20Nth%20Node%20From%20End%20of%20List.cpp) | Medium | Linked List / Two Pointers |
| 20 | [Valid Parentheses](https://leetcode.com/problems/valid-parentheses/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/020.%20Valid%20Parentheses.cpp) | Easy | Stack |
| 21 | [Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/021.%20Merge%20Two%20Sorted%20Lists.cpp) | Easy | Linked List |
| 22 | [Generate Parentheses](https://leetcode.com/problems/generate-parentheses/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/022.%20Generate%20Parentheses.cpp) | Medium | String / Backtracking |
| 23 | [Merge k Sorted Lists](https://leetcode.com/problems/merge-k-sorted-lists/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/023.%20Merge%20k%20Sorted%20Lists.cpp) | Hard | Linked List / Heap |
| 24 | [Swap Nodes in Pairs](https://leetcode.com/problems/swap-nodes-in-pairs/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/024.%20Swap%20Nodes%20in%20Pairs.cpp) | Medium | Linked List |
| 25 | [Reverse Nodes in k-Group](https://leetcode.com/problems/reverse-nodes-in-k-group/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/025.%20Reverse%20Nodes%20in%20k-Group.cpp) | Hard | Linked List |
| 26 | [Remove Duplicates from Sorted Array](https://leetcode.com/problems/remove-duplicates-from-sorted-array/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/026.%20Remove%20Duplicates%20from%20Sorted%20Array.cpp) | Easy | Array / Two Pointers |
| 27 | [Remove Element](https://leetcode.com/problems/remove-element/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/027.%20Remove%20Element.cpp) | Easy | Array / Two Pointers |
| 28 | [Implement strStr()](https://leetcode.com/problems/implement-strstr/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/028.%20Implement%20strStr().cpp) | Easy | String |
| 29 | [Implement strStr()](https://leetcode.com/problems/implement-strstr/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/029.cpp) | Easy | String |
| 31 | [Next Permutation](https://leetcode.com/problems/next-permutation/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/031.%20Next%20Permutation.cpp) | Medium | Array |
| 33 | [Search in Rotated Sorted Array](https://leetcode.com/problems/search-in-rotated-sorted-array/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/033.%20Search%20in%20Rotated%20Sorted%20Array.cpp) | Medium | Array / Binary Search |
| 34 | [Search for a Range](https://leetcode.com/problems/search-for-a-range/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/034.%20Search%20for%20a%20Range.cpp) | Medium | Array / Binary Search |
| 35 | [Search Insert Position](https://leetcode.com/problems/search-insert-position/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/035.%20Search%20Insert%20Position.cpp) | Easy | Array / Binary Search |
| 36 | [Valid Sudoku](https://leetcode.com/problems/valid-sudoku/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/036.%20Valid%20Sudoku.cpp) | Medium | Hash Table |
| 37 | [Sudoku Solver](https://leetcode.com/problems/valid-sudoku/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/037.%20Sudoku%20Solver.cpp) | Medium | Hash Table |
| 38 | [Count and Say](https://leetcode.com/problems/count-and-say/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/038.%20Count%20and%20Say.cpp) | Easy | String |
| 39 | [Combination Sum](https://leetcode.com/problems/combination-sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/039.%20Combination%20Sum.cpp) | Medium | Array / Backtracking |
| 40 | [Combination Sum II](https://leetcode.com/problems/combination-sum-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/040.%20Combination%20Sum%20II.cpp) | Medium | Array / Backtracking |
| 41 | [First Missing Positive](https://leetcode.com/problems/first-missing-positive/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/041.%20First%20Missing%20Positive.cpp) | Hard | Array |
| 42 | [Trapping Rain Water](https://leetcode.com/problems/trapping-rain-water/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/042.%20Trapping%20Rain%20Water.cpp) | Hard | Array / Two Pointers / Stack |
| 43 | [Multiply Strings](https://leetcode.com/problems/multiply-strings/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/043.%20Multiply%20Strings.cpp) | Medium | String |
| 44 | [Wildcard Matching](https://leetcode.com/problems/wildcard-matching/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/044.%20Wildcard%20Matching.cpp) | Hard | String / Backtracking / Greedy |
| 45 | [Jump Game II](https://leetcode.com/problems/jump-game-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/045.%20Jump%20Game%20II.cpp) | Hard | Array / Greedy |
| 46 | [Permutations](https://leetcode.com/problems/permutations/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/046.%20Permutations.cpp) | Medium | Backtracking |
| 47 | [Permutations II](https://leetcode.com/problems/permutations-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/047.%20Permutations%20II.cpp) | Medium | Backtracking |
| 48 | [Rotate Image](https://leetcode.com/problems/rotate-image/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/048.%20Rotate%20Image.cpp) | Medium | Matrix |
| 49 | [Group Anagrams](https://leetcode.com/problems/group-anagrams/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/049.%20Group%20Anagrams.cpp) | Medium | Hash Table / String |
| 50 | [Pow(x, n)](https://leetcode.com/problems/powx-n/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/050.%20Pow(x%2C%20n).cpp) | Medium | Binary Search |
| 51 | [Pow(x, n)](https://leetcode.com/problems/powx-n/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/051.%20N-Queens.cpp) | Medium | Binary Search |
| 52 | [Pow(x, n)](https://leetcode.com/problems/powx-n/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/052.%20N-Queens%20II.cpp) | Medium | Binary Search |
| 53 | [Maximum Subarray](https://leetcode.com/problems/maximum-subarray/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/053.%20Maximum%20Subarray.cpp) | Easy | Dynamic Programming / Array |
| 54 | [Spiral Matrix](https://leetcode.com/problems/spiral-matrix/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/054.%20Spiral%20Matrix.cpp) | Medium | Array |
| 55 | [Jump Game](https://leetcode.com/problems/jump-game/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/055.%20Jump%20Game.cpp) | Medium | Array / Greedy |
| 56 | [Merge Intervals](https://leetcode.com/problems/merge-intervals/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/056.%20Merge%20Intervals.cpp) | Medium | Array / Sort |
| 57 | [Insert Interval](https://leetcode.com/problems/insert-interval/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/057.%20Insert%20Interval.cpp) | Hard | Array / Sort |
| 58 | [Length of Last Word](https://leetcode.com/problems/length-of-last-word/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/058.%20Length%20of%20Last%20Word.cpp) | Easy | String |
| 59 | [Spiral Matrix II](https://leetcode.com/problems/spiral-matrix-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/059.%20Spiral%20Matrix%20II.cpp) | Medium | Array |
| 60 | [Permutation Sequence](https://leetcode.com/problems/permutation-sequence/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/060.%20Permutation%20Sequence.cpp) | Medium | Backtracking / Math |
| 61 | [Rotate List](https://leetcode.com/problems/rotate-list/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/061.%20Rotate%20List.cpp) | Medium | Linked List / Two Pointers |
| 62 | [Unique Paths](https://leetcode.com/problems/unique-paths/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/062.%20Unique%20Paths.cpp) | Medium | Array / Dynamic Programming |
| 63 | [Unique Paths II](https://leetcode.com/problems/unique-paths-ii/description/) | [C++](https://github.com/fengvyi/LeetCode/blob/master/C%2B%2B/063.%20Unique%20Paths%20II.cpp) | Medium | Array / Dynamic Programming |
| 64 | [Minimum Path Sum](https://leetcode.com/problems/minimum-path-sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/064.%20Minimum%20Path%20Sum.cpp) | Medium | Array / Dynamic Programming |
| 65 | [Valid Number](https://leetcode.com/problems/minimum-path-sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/065.%20Valid%20Number.cpp) | Medium | Array / Dynamic Programming |
| 66 | [Plus One](https://leetcode.com/problems/plus-one/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/066.%20Plus%20One.cpp) | Easy | Array / Math |
| 67 | [Add Binary](https://leetcode.com/problems/add-binary/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/067.%20Add%20Binary.cpp) | Easy | String |
| 68 | [Text Justification](https://leetcode.com/problems/text-justification/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/068.%20Text%20Justification.cpp) | Hard | String |
| 69 | [Sqrt(x)](https://leetcode.com/problems/sqrtx/description/) | [C++](https://github.com/fengvyi/LeetCode/blob/master/C%2B%2B/069.%20Sqrt(x).cpp) | Easy | Binary Search / Math |
| 70 | [Climbing Stairs](https://leetcode.com/problems/climbing-stairs/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/070.%20Climbing%20Stairs.cpp) | Easy | Dynamic Programming |
| 71 | [Simplify Path](https://leetcode.com/problems/simplify-path/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/071.%20Simplify%20Path.cpp) | Medium | Stack / String |
| 72 | [Edit Distance](https://leetcode.com/problems/simplify-path/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/072.%20Edit%20Distance.cpp) | Medium | Stack / String |
| 73 | [Set Matrix Zeroes](https://leetcode.com/problems/set-matrix-zeroes/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/073.%20Set%20Matrix%20Zeroes.cpp) | Medium | Array |
| 74 | [Search a 2D Matrix](https://leetcode.com/problems/search-a-2d-matrix/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/074.%20Search%20a%202D%20Matrix.cpp) | Medium | Array / Binary Search |
| 75 | [Sort Colors](https://leetcode.com/problems/sort-colors/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/075.%20Sort%20Colors.cpp) | Medium | Array / Two Pointers |
| 76 | [Minimum Window Substring](https://leetcode.com/problems/minimum-window-substring/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/076.%20Minimum%20Window%20Substring.cpp) | Hard | Hash Table / Two pointers / String |
| 78 | [Subsets](https://leetcode.com/problems/subsets/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/078.%20Subsets.cpp) | Medium | Array / Backtracking |
| 79 | [Word Search](https://leetcode.com/problems/word-search/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/079.%20Word%20Search.cpp) | Medium | Matrix / Backtracking |
| 80 | [Remove Duplicates from Sorted Array II](https://leetcode.com/problems/remove-duplicates-from-sorted-array-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/080.%20Remove%20Duplicates%20from%20Sorted%20Array%20II.cpp) | Medium | Array / Two Pointers |
| 82 | [Remove Duplicates from Sorted List II](https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/082.%20Remove%20Duplicates%20from%20Sorted%20List%20II.cpp) | Medium | Linked List |
| 83 | [Remove Duplicates from Sorted List](https://leetcode.com/problems/remove-duplicates-from-sorted-list/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/083.%20Remove%20Duplicates%20from%20Sorted%20List.cpp) | Easy | Linked List |
| 84 | [Largest Rectangle in Histogram](https://leetcode.com/problems/maximal-rectangle/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/084.%20Largest%20Rectangle%20in%20Histogram.cpp) | Hard | Array |
| 85 | [Maximal Rectangle](https://leetcode.com/problems/maximal-rectangle/description/) | [C++](https://github.com/fengvyi/LeetCode/blob/master/C%2B%2B/085.%20Maximal%20Rectangle.cpp) | Hard | Array |
| 86 | [Partition List](https://leetcode.com/problems/partition-list/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/086.%20Partition%20List.cpp) | Medium | Linked List |
| 88 | [Merge Sorted Array](https://leetcode.com/problems/merge-sorted-array/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/088.%20Merge%20Sorted%20Array.cpp) | Easy | Array / Two Pointers |
| 90 | [Subsets II](https://leetcode.com/problems/subsets-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/090.%20Subsets%20II.cpp) | Medium | Array / Backtracking |
| 91 | [Decode Ways](https://leetcode.com/problems/decode-ways/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/091.%20Decode%20Ways.cpp) | Medium | Dynamic Programming / String |
| 92 | [Reverse Linked List II](https://leetcode.com/problems/reverse-linked-list-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/092.%20Reverse%20Linked%20List%20II.cpp) | Medium | Linked List |
| 94 | [Binary Tree Inorder Traversal](https://leetcode.com/problems/binary-tree-inorder-traversal/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/094.%20Binary%20Tree%20Inorder%20Traversal.cpp) | Medium | Tree / Stack |
| 95 | [Unique Binary Search Trees II](https://leetcode.com/problems/unique-binary-search-trees-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/095.%20Unique%20Binary%20Search%20Trees%20II.cpp) | Medium | Tree |
| 96 | [Unique Binary Search Trees](https://leetcode.com/problems/recover-binary-search-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/096.%20Unique%20Binary%20Search%20Trees.cpp) | Hard | Tree / DFS |
| 97 | [Interleaving String](https://leetcode.com/problems/recover-binary-search-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/097.%20Interleaving%20String.cpp) | Hard | Tree / DFS |
| 98 | [Validate Binary Search Tree](https://leetcode.com/problems/validate-binary-search-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/098.%20Validate%20Binary%20Search%20Tree.cpp) | Medium | Tree |
| 99 | [Recover Binary Search Tree](https://leetcode.com/problems/recover-binary-search-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/099.%20Recover%20Binary%20Search%20Tree.cpp) | Hard | Tree / DFS |
| 100 | [Same Tree](https://leetcode.com/problems/same-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/100.%20Same%20Tree.cpp) | Easy | Tree / DFS |
| 101 | [Symmetric Tree](https://leetcode.com/problems/symmetric-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/101.%20Symmetric%20Tree.cpp) | Easy | Tree |
| 102 | [Binary Tree Level Order Traversal](https://leetcode.com/problems/binary-tree-level-order-traversal/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/102.%20Binary%20Tree%20Level%20Order%20Traversal.cpp) | Medium | Tree / DFS / BFS |
| 103 | [Binary Tree Zigzag Level Order Traversal](https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/103.%20Binary%20Tree%20Zigzag%20Level%20Order%20Traversal.cpp) | Medium | Tree / BFS |
| 104 | [Maximum Depth of Binary Tree](https://leetcode.com/problems/maximum-depth-of-binary-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/104.%20Maximum%20Depth%20of%20Binary%20Tree.cpp) | Easy | Tree |
| 105 | [Construct Binary Tree from Preorder and Inorder Traversal](https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/105.%20Construct%20Binary%20Tree%20from%20Preorder%20and%20Inorder%20Traversal.cpp) | Medium | Array / Tree / DFS |
| 106 | [Construct Binary Tree from Inorder and Postorder Traversal](https://leetcode.com/problems/convert-sorted-list-to-binary-search-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/106.%20Construct%20Binary%20Tree%20from%20Inorder%20and%20Postorder%20Traversal.cpp) | Medium | Linked List / DFS |
| 107 | [Binary Tree Level Order Traversal II](https://leetcode.com/problems/binary-tree-level-order-traversal-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/107.%20Binary%20Tree%20Level%20Order%20Traversal%20II.cpp) | Easy | Tree |
| 108 | [Convert Sorted Array to Binary Search Tree](https://leetcode.com/problems/convert-sorted-array-to-binary-search-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/108.%20Convert%20Sorted%20Array%20to%20Binary%20Search%20Tree.cpp) | Easy | Tree / DFS |
| 109 | [Convert Sorted List to Binary Search Tree](https://leetcode.com/problems/convert-sorted-list-to-binary-search-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/109.%20Convert%20Sorted%20List%20to%20Binary%20Search%20Tree.cpp) | Medium | Linked List / DFS |
| 110 | [Balanced Binary Tree](https://leetcode.com/problems/balanced-binary-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/110.%20Balanced%20Binary%20Tree.cpp) | Easy | Tree / DFS |
| 111 | [Minimum Depth of Binary Tree](https://leetcode.com/problems/minimum-depth-of-binary-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/111.%20Minimum%20Depth%20of%20Binary%20Tree.cpp) | Easy | Tree |
| 112 | [Path Sum](https://leetcode.com/problems/path-sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/112.%20Path%20Sum.cpp) | Easy | Tree / DFS |
| 113 | [Path Sum II](https://leetcode.com/problems/path-sum-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/113.%20Path%20Sum%20II.cpp) | Medium | Tree / DFS |
| 114 | [Flatten Binary Tree to Linked List](https://leetcode.com/problems/flatten-binary-tree-to-linked-list/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/114.%20Flatten%20Binary%20Tree%20to%20Linked%20List.cpp) | Medium | Tree / DFS |
| 116 | [Populating Next Right Pointers in Each Node](https://leetcode.com/problems/populating-next-right-pointers-in-each-node/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/116.%20Populating%20Next%20Right%20Pointers%20in%20Each%20Node.cpp) | Medium | Tree / BFS |
| 117 | [Populating Next Right Pointers in Each Node II](https://leetcode.com/problems/populating-next-right-pointers-in-each-node-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/117.%20Populating%20Next%20Right%20Pointers%20in%20Each%20Node%20II.cpp) | Medium | Tree / Level-order Traversal |
| 118 | [Pascal's Triangle](https://leetcode.com/problems/pascals-triangle/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/118.%20Pascal's%20Triangle.cpp) | Easy | Array | [discuss](https://leetcode.com/problems/pascals-triangle/discuss/123054/9-lines-C++-recursion) |
| 119 | [Pascal's Triangle II](https://leetcode.com/problems/pascals-triangle-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/119.%20Pascal's%20Triangle%20II.cpp) | Easy | Array |
| 120 | [Triangle](https://leetcode.com/problems/triangle/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/120.%20Triangle.cpp) | Medium | Array / Dynamic Programming |
| 121 | [Best Time to Buy and Sell Stock](https://leetcode.com/problems/best-time-to-buy-and-sell-stock/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/121.%20Best%20Time%20to%20Buy%20and%20Sell%20Stock.cpp) | Easy | Array / Dynamic Programming |
| 122 | [Best Time to Buy and Sell Stock](https://leetcode.com/problems/binary-tree-maximum-path-sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/122.%20Best%20Time%20to%20Buy%20and%20Sell%20Stock%20II.cpp) | Hard | Tree / DFS |
| 123 | [Best Time to Buy and Sell Stock](https://leetcode.com/problems/binary-tree-maximum-path-sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/123.%20Best%20Time%20to%20Buy%20and%20Sell%20Stock%20III.cpp) | Hard | Tree / DFS | [discuss](https://discuss.leetcode.com/topic/104532/8-lines-c-similar-to-diameter-of-tree) |
| 124 | [Binary Tree Maximum Path Sum](https://leetcode.com/problems/binary-tree-maximum-path-sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/124.%20Binary%20Tree%20Maximum%20Path%20Sum.cpp) | Hard | Tree / DFS |
| 125 | [Valid Palindrome](https://leetcode.com/problems/valid-palindrome/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/125.%20Valid%20Palindrome.cpp) | Easy | String / Two Pointers |
| 126 | [Word Ladder ](https://leetcode.com/problems/longest-consecutive-sequence/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/126.%20Word%20Ladder%20II.cpp) | Hard | Array / Unoin Find |
| 127 | [Word Ladder](https://leetcode.com/problems/word-ladder/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/127.%20Word%20Ladder.cpp) | Medium | String / BFS | [discuss](https://discuss.leetcode.com/topic/101076/clean-c-bfs) |
| 128 | [Longest Consecutive Sequence](https://leetcode.com/problems/longest-consecutive-sequence/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/128.%20Longest%20Consecutive%20Sequence.cpp) | Hard | Array / Unoin Find | [discuss](https://discuss.leetcode.com/topic/100724/10-lines-c) |
| 129 | [Sum Root to Leaf Numbers](https://leetcode.com/problems/sum-root-to-leaf-numbers/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/129.%20Sum%20Root%20to%20Leaf%20Numbers.cpp) | Medium | Tree / DFS / BFS | [discuss](https://leetcode.com/problems/sum-root-to-leaf-numbers/discuss/121401/C++-DFS-and-BFS-solution) |
| 130 | [Surrounded Regions](https://leetcode.com/problems/surrounded-regions/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/130.%20Surrounded%20Regions.cpp) | Medium | DFS / BFS / Union Find | [discuss](https://discuss.leetcode.com/topic/119417/c-dfs-union-find-solution) |
| 131 | [Palindrome Partitioning](https://leetcode.com/problems/palindrome-partitioning/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/131.%20Palindrome%20Partitioning.cpp) | Medium | Backtracking | [discuss](https://leetcode.com/problems/palindrome-partitioning/discuss/129637/C++-backtracking) |
| 132 | [Palindrome Partitioning](https://leetcode.com/problems/single-number/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/132.%20Palindrome%20Partitioning%20II.cpp) | Easy | Bit Manipulation | [discuss](https://leetcode.com/problems/single-number/discuss/129372/3-lines-C++) |
| 133 | [Clone Graph](https://leetcode.com/problems/clone-graph/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/133.%20Clone%20Graph.cpp) | Medium | Graph / DFS / BFS | [discuss](https://discuss.leetcode.com/topic/101082/clean-c-dfs-29ms) |
| 134 | [Gas Station](https://leetcode.com/problems/gas-station/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/134.%20Gas%20Station.cpp) | Medium | Greedy | [discuss](https://leetcode.com/problems/gas-station/discuss/198746/Simple-C++-greedy) |
| 136 | [Single Number](https://leetcode.com/problems/single-number/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/136.%20Single%20Number.cpp) | Easy | Bit Manipulation | [discuss](https://leetcode.com/problems/single-number/discuss/129372/3-lines-C++) |
| 137 | [Single Numberll](https://leetcode.com/problems/word-break/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/137.%20Single%20Number%20II.cpp) | Medium | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/101231/clean-c-9ms-dp) |
| 138 | [Copy List with Random Pointer](https://leetcode.com/problems/copy-list-with-random-pointer/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/138.%20Copy%20List%20with%20Random%20Pointer.cpp) | Medium | Hash Table / Linked List | [discuss](https://leetcode.com/problems/copy-list-with-random-pointer/discuss/131629/Simple-C++-hashmap-solution) |
| 139 | [Word Break](https://leetcode.com/problems/word-break/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/139.%20Word%20Break.cpp) | Medium | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/101231/clean-c-9ms-dp) |
| 140 | [Word BreakII](https://leetcode.com/problems/word-break/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/140.%20Word%20Break%20II.cpp) | Medium | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/101231/clean-c-9ms-dp) |
| 141 | [Linked List Cycle](https://leetcode.com/problems/linked-list-cycle/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/141.%20Linked%20List%20Cycle.cpp) | Easy | Linked List / Two Pointers | [discuss](https://leetcode.com/problems/linked-list-cycle/discuss/131632/7-lines-C++) |
| 142 | [Linked List Cycle II](https://leetcode.com/problems/linked-list-cycle-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/142.%20Linked%20List%20Cycle%20II.cpp) | Medium | Linked List / Two Pointers | [discuss](https://leetcode.com/problems/linked-list-cycle-ii/discuss/131635/10ms-C++-solution) |
| 143 | [Reorder List](https://leetcode.com/problems/reorder-list/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/143.%20Reorder%20List.cpp) | Medium | Linked List | [discuss](https://discuss.leetcode.com/topic/96122/clear-c-o-1-space-solution) |
| 144 | [Binary Tree Preorder Traversal](https://leetcode.com/problems/binary-tree-preorder-traversal/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/144.%20Binary%20Tree%20Preorder%20Traversal.cpp) | Medium | Tree / Stack |
| 145 | [Binary Tree Postorder Traversal](https://leetcode.com/problems/binary-tree-postorder-traversal/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/145.%20Binary%20Tree%20Postorder%20Traversal.cpp) | Hard | Tree / Stack | [discuss](https://discuss.leetcode.com/topic/107713/c-iterative-recursive-solutions) |
| 146 | [LRU Cache](https://leetcode.com/problems/lru-cache/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/146.%20LRU%20Cache.cpp) | Hard | Design | [discuss](https://discuss.leetcode.com/topic/109805/concise-c-82ms-hash-table-deque-solution) |
| 147 | [Insertion Sort List](https://leetcode.com/problems/min-stack/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/147.%20Insertion%20Sort%20List.cpp) | Easy | Stack / Design | [discuss](https://discuss.leetcode.com/topic/105788/8-lines-c) |
| 148 | [Sort List](https://leetcode.com/problems/min-stack/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/148.%20Sort%20List.cpp) | Easy | Stack / Design | [discuss](https://discuss.leetcode.com/topic/105788/8-lines-c) |
| 149 | [ Max Points on a Line](https://leetcode.com/problems/min-stack/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/149.%20Max%20Points%20on%20a%20Line.cpp) | Easy | Stack / Design | [discuss](https://discuss.leetcode.com/topic/105788/8-lines-c) |
| 151 | [Reverse Words in a String](https://leetcode.com/problems/reverse-words-in-a-string/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/151.%20Reverse%20Words%20in%20a%20String.cpp) | Medium | String | [discuss](https://discuss.leetcode.com/topic/102920/c-o-1-space) |
| 152 | [Maximum Product Subarray](https://leetcode.com/problems/longest-substring-with-at-most-two-distinct-characters/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/152.%20Maximum%20Product%20Subarray.cpp) | Hard | String / Two Pointers | [discuss](https://discuss.leetcode.com/topic/108306/c-two-pointers-unordered_set) |
| 153 | [Find Minimum in Rotated Sorted Array](https://leetcode.com/problems/longest-substring-with-at-most-two-distinct-characters/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/153.%20Find%20Minimum%20in%20Rotated%20Sorted%20Array.cpp) | Hard | String / Two Pointers | [discuss](https://discuss.leetcode.com/topic/108306/c-two-pointers-unordered_set) |
| 154 | [Find Minimum in Rotated Sorted Array](https://leetcode.com/problems/longest-substring-with-at-most-two-distinct-characters/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/154.%20Find%20Minimum%20in%20Rotated%20Sorted%20Array%20II.cpp) | Hard | String / Two Pointers |
| 155 | [Min Stack](https://leetcode.com/problems/min-stack/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/155.%20Min%20Stack.cpp) | Easy | Stack / Design |
| 157 | [Read N Characters Given Read4](https://leetcode.com/problems/read-n-characters-given-read4/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/157.%20Read%20N%20Characters%20Given%20Read4.cpp) | Easy | String |
| 158 | [Read N Characters Given Read4 II - Call multiple times](https://leetcode.com/problems/read-n-characters-given-read4-ii-call-multiple-times/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/158.%20Read%20N%20Characters%20Given%20Read4%20II%20-%20Call%20multiple%20times.cpp) | Hard | String |
| 159 | [Longest Substring with At Most Two Distinct Characters](https://leetcode.com/problems/longest-substring-with-at-most-two-distinct-characters/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/159.%20Longest%20Substring%20with%20At%20Most%20Two%20Distinct%20Characters.cpp) | Hard | String / Two Pointers |
| 160 | [Intersection of Two Linked Lists](https://leetcode.com/problems/one-edit-distance/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/160.%20Intersection%20of%20Two%20Linked%20Lists.cpp) | Medium | String |
| 161 | [One Edit Distance](https://leetcode.com/problems/one-edit-distance/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/161.%20One%20Edit%20Distance.cpp) | Medium | String |
| 162 | [Find Peak Element](https://leetcode.com/problems/find-peak-element/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/162.%20Find%20Peak%20Element.cpp) | Medium | Binary Search |
| 163 | [Missing Ranges](https://leetcode.com/problems/missing-ranges/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/163.%20Missing%20Ranges.cpp) | Medium | Array |
| 168 | [Excel Sheet Column Title](https://leetcode.com/problems/excel-sheet-column-title/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/168.%20Excel%20Sheet%20Column%20Title.cpp) | Easy | Math |
| 169 | [Majority Element](https://leetcode.com/problems/majority-element/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/169.%20Majority%20Element.cpp) | Easy | Array |
| 171 | [Excel Sheet Column Number](https://leetcode.com/problems/excel-sheet-column-number/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/171.%20Excel%20Sheet%20Column%20Number.cpp) | Easy | Math | [discuss](https://leetcode.com/problems/excel-sheet-column-number/discuss/134153/6-lines-C++) |
| 173 | [Binary Search Tree Iterator](https://leetcode.com/problems/binary-search-tree-iterator/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/173.%20Binary%20Search%20Tree%20Iterator.cpp) | Medium | Tree / Stack / Design |
| 186 | [Reverse Words in a String II](https://leetcode.com/problems/reverse-words-in-a-string-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/186.%20Reverse%20Words%20in%20a%20String%20II.cpp) | Medium | String |
| 191 | [Number of 1 Bits](https://leetcode.com/problems/number-of-1-bits/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/191.%20Number%20of%201%20Bits.cpp) | Easy | Bit Manipulation |
| 198 | [House Robber](https://leetcode.com/problems/house-robber/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/198.%20House%20Robber.cpp) | Easy | Dynamic Programming |
| 200 | [Number of Islands](https://leetcode.com/problems/number-of-islands/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/200.%20Number%20of%20Islands.cpp) | Medium | BFS / Union Find |
| 205 | [Isomorphic Strings](https://leetcode.com/problems/isomorphic-strings/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/205.%20Isomorphic%20Strings.cpp) | Easy | Hash Table |
| 206 | [Reverse Linked List](https://leetcode.com/problems/reverse-linked-list/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/206.%20Reverse%20Linked%20List.cpp) | Easy | Linked List |
| 207 | [Course Schedule](https://leetcode.com/problems/course-schedule/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/207.%20Course%20Schedule.cpp) | Medium | Graph / BFS / Topological Sort |
| 208 | [Implement Trie (Prefix Tree)](https://leetcode.com/problems/implement-trie-prefix-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/208.%20Implement%20Trie%20(Prefix%20Tree).cpp) | Medium | Trie / Design |
| 209 | [Minimum Size Subarray Sum](https://leetcode.com/problems/minimum-size-subarray-sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/209.%20Minimum%20Size%20Subarray%20Sum.cpp) | Medium | Array / Two Pointers |
| 210 | [Course Schedule II](https://leetcode.com/problems/course-schedule-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/210.%20Course%20Schedule%20II.cpp) | Medium | Graph / BFS / Topological Sort |
| 211 | [Add and Search Word - Data structure design](https://leetcode.com/problems/add-and-search-word-data-structure-design/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/211.%20Add%20and%20Search%20Word%20-%20Data%20structure%20design.cpp) | Medium | Design / Trie | [discuss](https://discuss.leetcode.com/topic/100013/c-62ms-beats-100) |
| 212 | [Word Search II](https://leetcode.com/problems/word-search-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/212.%20Word%20Search%20II.cpp) | Hard | Backtracking / Trie | [discuss](https://discuss.leetcode.com/topic/83017/c-462-ms-brute-force-and-35-ms-trie-solution) |
| 214 | [Shortest Palindrome](https://leetcode.com/problems/shortest-palindrome/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/214.%20Shortest%20Palindrome.cpp) | Hard | String |
| 215 | [Kth Largest Element in an Array](https://leetcode.com/problems/kth-largest-element-in-an-array/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/215.%20Kth%20Largest%20Element%20in%20an%20Array.cpp) | Medium | Sort / Partition |
| 221 | [Maximal Square](https://leetcode.com/problems/maximal-square/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/221.%20Maximal%20Square.cpp) | Medium | Dynamic Programming / BFS |
| 223 | [Rectangle Area](https://leetcode.com/problems/rectangle-area/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/223.%20Rectangle%20Area.cpp) | Medium | Math |
| 224 | [Basic Calculator](https://leetcode.com/problems/basic-calculator/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/224.%20Basic%20Calculator.cpp) | Hard | String / Stack | [discuss](https://discuss.leetcode.com/topic/108357/c-13ms-stack-solution) |
| 226 | [Invert Binary Tree](https://leetcode.com/problems/invert-binary-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/226.%20Invert%20Binary%20Tree.cpp) | Easy | Tree | [discuss](https://discuss.leetcode.com/topic/85926/clean-c-recursive-iterative-solution) |
| 227 | [Basic Calculator II](https://leetcode.com/problems/basic-calculator-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/227.%20Basic%20Calculator%20II.cpp) | Medium | String | [discuss](https://discuss.leetcode.com/topic/98114/clean-16-lines-c-using-lambda) |
| 228 | [Summary Ranges](https://leetcode.com/problems/summary-ranges/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/228.%20Summary%20Ranges.cpp) | Medium | Array | [discuss](https://discuss.leetcode.com/topic/108363/6-lines-c) |
| 229 | [Majority Element II](https://leetcode.com/problems/majority-element-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/229.%20Majority%20Element%20II.cpp) | Medium | Array | [discuss](https://discuss.leetcode.com/topic/85914/c-12-ms-o-1-space-boyer-moore-majority-vote-algorithm) |
| 230 | [Kth Smallest Element in a BST](https://leetcode.com/problems/kth-smallest-element-in-a-bst/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/230.%20Kth%20Smallest%20Element%20in%20a%20BST.cpp) | Medium | Tree | [discuss](https://discuss.leetcode.com/topic/80538/two-8-lines-solutions-in-c-easy-to-understand) |
| 231 | [Power of Two](https://leetcode.com/problems/power-of-two/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/231.%20Power%20of%20Two.cpp) | Easy | Bit Manipulation | [discuss](https://discuss.leetcode.com/topic/108365/one-line-c) |
| 234 | [Palindrome Linked List](https://leetcode.com/problems/palindrome-linked-list/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/234.%20Palindrome%20Linked%20List.cpp) | Easy | Linked List / Two Pointers | [discuss](https://discuss.leetcode.com/topic/101317/clean-c-o-1-space) |
| 235 | [Lowest Common Ancestor of a Binary Search Tree](https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/235.%20Lowest%20Common%20Ancestor%20of%20a%20Binary%20Search%20Tree.cpp) | Easy | Tree | [discuss](https://discuss.leetcode.com/topic/86300/share-my-c-26ms-recursion) |
| 236 | [Lowest Common Ancestor of a Binary Tree](https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/236.%20Lowest%20Common%20Ancestor%20of%20a%20Binary%20Tree.cpp) | Medium | Tree | [discuss](https://discuss.leetcode.com/topic/79268/c-dfs-brute-force-solution) |
| 238 | [Product of Array Except Self](https://leetcode.com/problems/product-of-array-except-self/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/238.%20Product%20of%20Array%20Except%20Self.cpp) | Medium | Array | [discuss](https://discuss.leetcode.com/topic/101324/c-o-n) |
| 239 | [Sliding Window Maximum](https://leetcode.com/problems/sliding-window-maximum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/239.%20Sliding%20Window%20Maximum.cpp) | Hard |Heap | [discuss](https://discuss.leetcode.com/topic/77089/clean-c-62ms-solution-beats-98-22-no-extra-space) |
| 240 | [Search a 2D Matrix II](https://leetcode.com/problems/search-a-2d-matrix-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/240.%20Search%20a%202D%20Matrix%20II.cpp) | Medium | Binary Search / Divide and Conquer | [discuss](https://discuss.leetcode.com/topic/108479/two-c-solutions) |
| 244 | [Shortest Word Distance II](https://leetcode.com/problems/shortest-word-distance-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/244.%20Shortest%20Word%20Distance%20II.cpp) | Medium | Hash Table / Design | [discuss](https://leetcode.com/problems/shortest-word-distance-ii/discuss/121877/C++-O(n)-solution) |
| 246 | [Strobogrammatic Number](https://leetcode.com/problems/strobogrammatic-number/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/246.%20Strobogrammatic%20Number.cpp) | Easy | Hash Table / Math | [discuss](https://discuss.leetcode.com/topic/91838/7-lines-c-0ms) |
| 247 | [Strobogrammatic Number II](https://leetcode.com/problems/strobogrammatic-number-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/247.%20Strobogrammatic%20Number%20II.cpp) | Medium | Math / Recursion | [discuss](https://discuss.leetcode.com/topic/105993/c-recursion) |
| 249 | [Group Shifted Strings](https://leetcode.com/problems/group-shifted-strings/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/249.%20Group%20Shifted%20Strings.cpp) | Medium | String | [discuss](https://discuss.leetcode.com/topic/105677/6ms-c-easy-to-understand) |
| 251 | [Flatten 2D Vector](https://leetcode.com/problems/flatten-2d-vector/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/247.%20Strobogrammatic%20Number%20II.cpp) | Medium | Design | [discuss](https://discuss.leetcode.com/topic/104514/6-lines-c) |
| 252 | [Meeting Rooms](https://leetcode.com/problems/meeting-rooms/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/252.%20Meeting%20Rooms.cpp) | Easy | Sort | [discuss](https://discuss.leetcode.com/topic/88677/c-4-lines-concise-solution-using-lambda) |
| 253 | [Meeting Rooms II](https://leetcode.com/problems/meeting-rooms-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/253.%20Meeting%20Rooms%20II.cpp) | Medium | Heap / Sort | [discuss](https://discuss.leetcode.com/topic/98299/c-11-lines-9ms-min-heap) |
| 255 | [Verify Preorder Sequence in Binary Search Tree](https://leetcode.com/problems/verify-preorder-sequence-in-binary-search-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/255.%20Verify%20Preorder%20Sequence%20in%20Binary%20Search%20Tree.cpp) | Medium | Stack / Tree | [discuss](https://leetcode.com/problems/verify-preorder-sequence-in-binary-search-tree/discuss/116243/7-lines-C++-DandC) |
| 257 | [Binary Tree Paths](https://leetcode.com/problems/binary-tree-paths/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/257.%20Binary%20Tree%20Paths.cpp) | Easy | Tree / DFS / BFS | [discuss](https://discuss.leetcode.com/topic/87776/c-simple-12-lines-3ms-dfs) |
| 258 | [Add Digits](https://leetcode.com/problems/add-digits/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/258.%20Add%20Digits.cpp) | Easy | Math | [discuss](https://discuss.leetcode.com/topic/85916/1-line-c) |
| 259 | [3Sum Smaller](https://leetcode.com/problems/3sum-smaller/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/259.%203Sum%20Smaller.cpp) | Medium | Array / Two Pointers | [discuss](https://discuss.leetcode.com/topic/105684/8-lines-c-o-n-2) |
| 261 | [Graph Valid Tree](https://leetcode.com/problems/graph-valid-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/261.%20Graph%20Valid%20Tree.cpp) | Medium | Graph / BFS / DFS / Union Find | [discuss](https://discuss.leetcode.com/topic/100516/clean-c-bfs-9ms-find-circle-in-graph) |
| 263 | [Ugly Number](https://leetcode.com/problems/ugly-number/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/263.%20Ugly%20Number.cpp) | Easy | Math | [discuss](https://discuss.leetcode.com/topic/102165/one-line-c) |
| 264 | [Ugly Number II](https://leetcode.com/problems/ugly-number-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/264.%20Ugly%20Number%20II.cpp) | Medium | Dynamic Programming / Math | [discuss](https://discuss.leetcode.com/topic/102172/10-lines-c) |
| 266 | [Palindrome Permutation](https://leetcode.com/problems/palindrome-permutation/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/266.%20Palindrome%20Permutation.cpp) | Easy | Hash Table | [discuss](https://discuss.leetcode.com/topic/91044/4-lines-c-hash-table) |
| 267 | [Palindrome Permutation II](https://leetcode.com/problems/palindrome-permutation-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/267.%20Palindrome%20Permutation%20II.cpp) | Medium | Backtracking | [discuss](https://leetcode.com/problems/palindrome-permutation-ii/discuss/121889/3ms-C++-backtracking) |
| 268 | [Missing Number](https://leetcode.com/problems/missing-number/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/268.%20Missing%20Number.cpp) | Easy | Array / Bit Manipulation | [discuss](https://leetcode.com/problems/missing-number/discuss/131408/3-lines-C++) |
| 269 | [Alien Dictionary](https://leetcode.com/problems/alien-dictionary/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/269.%20Alien%20Dictionary.cpp) | Hard | Graph / Topological Sort | [discuss](https://discuss.leetcode.com/topic/107067/short-c-bfs-topological-sort) |
| 270 | [Closest Binary Search Tree Value](https://leetcode.com/problems/closest-binary-search-tree-value/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/270.%20Closest%20Binary%20Search%20Tree%20Value.cpp) | Easy | Tree / Binary Search | [discuss](https://discuss.leetcode.com/topic/108393/7-lines-c) |
| 271 | [Encode and Decode Strings](https://leetcode.com/problems/encode-and-decode-strings/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/271.%20Encode%20and%20Decode%20Strings.cpp) | Medium | String / Design | [discuss](https://discuss.leetcode.com/topic/104401/c-encode-with) |
| 272 | [Closest Binary Search Tree Value II](https://leetcode.com/problems/closest-binary-search-tree-value-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/272.%20Closest%20Binary%20Search%20Tree%20Value%20II.cpp) | Hard | Tree / Stack | [discuss](https://discuss.leetcode.com/topic/109470/10-lines-c-o-nlogk-maxheap-solution) |
| 273 | [Integer to English Words](https://leetcode.com/problems/integer-to-english-words/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/273.%20Integer%20to%20English%20Words.cpp) | Hard | String | [discuss](https://discuss.leetcode.com/topic/104627/3ms-short-c) |
| 274 | [H-Index](https://leetcode.com/problems/h-index/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/274.%20H-Index.cpp) | Medium | Sort | [discuss](https://discuss.leetcode.com/topic/101496/4-lines-c) |
| 275 | [H-Index II](https://leetcode.com/problems/h-index-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/275.%20H-Index%20II.cpp) | Medium | Binary Search | [discuss](https://discuss.leetcode.com/topic/102873/c-3-lines-o-n-8-lines-binary-search-o-logn) |
| 276 | [Paint Fence](https://leetcode.com/problems/paint-fence/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/276.%20Paint%20Fence.cpp) | Easy | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/91156/4-lines-c) |
| 277 | [Find the Celebrity](https://leetcode.com/problems/find-the-celebrity/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/277.%20Find%20the%20Celebrity.cpp) | Medium | Array | [discuss](https://discuss.leetcode.com/topic/99937/c-o-n) |
| 278 | [First Bad Version](https://leetcode.com/problems/first-bad-version/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/278.%20First%20Bad%20Version.cpp) | Easy | Binary Search | [discuss](https://discuss.leetcode.com/topic/86885/c-5-lines-0ms-binary-search) |
| 279 | [Perfect Squares](https://leetcode.com/problems/perfect-squares/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/279.%20Perfect%20Squares.cpp) | Medium | Math / Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/108483/c-6ms-static-dp) |
| 280 | [Wiggle Sort](https://leetcode.com/problems/wiggle-sort/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/280.%20Wiggle%20Sort.cpp) | Easy | Array | [discuss](https://discuss.leetcode.com/topic/97352/short-c) |
| 281 | [Zigzag Iterator](https://leetcode.com/problems/zigzag-iterator/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/281.%20Zigzag%20Iterator.cpp) | Medium | Design | [discuss](https://discuss.leetcode.com/topic/104332/c-o-1-space-and-follow-up-for-k-vectors) |
| 282 | [Expression Add Operators](https://leetcode.com/problems/expression-add-operators/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/282.%20Expression%20Add%20Operators.cpp) | Hard | Divide and Conquer | [discuss](https://discuss.leetcode.com/topic/99983/c-backtracking) |
| 283 | [Move Zeroes](https://leetcode.com/problems/move-zeroes/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/283.%20Move%20Zeroes.cpp) | Easy | Array / Two Pointers | [discuss](https://discuss.leetcode.com/topic/85925/c-3-lines-solution) |
| 284 | [Peeking Iterator](https://leetcode.com/problems/peeking-iterator/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/284.%20Peeking%20Iterator.cpp) | Medum | Design | [discuss](https://discuss.leetcode.com/topic/105798/c-using-deque) |
| 285 | [Inorder Successor in BST](https://leetcode.com/problems/inorder-successor-in-bst/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/285.%20Inorder%20Successor%20in%20BST.cpp) | Medium | Tree | [discuss](https://discuss.leetcode.com/topic/100023/c-solution-for-any-binary-tree) |
| 286 | [Walls and Gates](https://leetcode.com/problems/walls-and-gates/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/286.%20Walls%20and%20Gates.cpp) | Medium | BFS | [discuss](https://discuss.leetcode.com/topic/100331/c-bfs-from-inf-or-0) |
| 289 | [Game of Life](https://leetcode.com/problems/game-of-life/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/289.%20Game%20of%20Life.cpp) | Medium | Array | [discuss](https://discuss.leetcode.com/topic/95672/c-in-place-solution) |
| 290 | [Word Pattern](https://leetcode.com/problems/word-pattern/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/290.%20Word%20Pattern.cpp) | Easy | Hash Table | [discuss](https://discuss.leetcode.com/topic/107956/11-lines-c) |
| 293 | [Flip Game](https://leetcode.com/problems/flip-game/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/293.%20Flip%20Game.cpp) | Easy | String | [discuss](https://discuss.leetcode.com/topic/108535/8-lines-c) |
| 294 | [Flip Game II](https://leetcode.com/problems/flip-game-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/294.%20Flip%20Game%20II.cpp) | Medium | Backtracking | [discuss](https://discuss.leetcode.com/topic/108539/7-lines-c) |
| 295 | [Find Median from Data Stream](https://leetcode.com/problems/find-median-from-data-stream/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/295.%20Find%20Median%20from%20Data%20Stream.cpp) | Hard | Heap / Design | [discuss](https://discuss.leetcode.com/topic/107631/c-two-heaps) |
| 297 | [Serialize and Deserialize Binary Tree](https://leetcode.com/problems/serialize-and-deserialize-binary-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/297.%20Serialize%20and%20Deserialize%20Binary%20Tree.cpp) | Hard | Tree / Design | [discuss](https://discuss.leetcode.com/topic/99965/c-8-lines-cheat-solution-22-ms-beats-99-57) |
| 298 | [Binary Tree Longest Consecutive Sequence](https://leetcode.com/problems/binary-tree-longest-consecutive-sequence/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/298.%20Binary%20Tree%20Longest%20Consecutive%20Sequence.cpp) | Medium | Tree | [discuss](https://discuss.leetcode.com/topic/104321/short-c-8-lines-dfs-and-12-lines-bfs) |
| 300 | [Longest Increasing Subsequence](https://leetcode.com/problems/longest-increasing-subsequence/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/300.%20Longest%20Increasing%20Subsequence.cpp) | Medium | Binary Search / Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/106903/short-c-o-n-2-dp-and-o-nlogn-binary-search) |
| 301 | [Remove Invalid Parentheses](https://leetcode.com/problems/remove-invalid-parentheses/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/301.%20Remove%20Invalid%20Parentheses.cpp) | Hard | Backtracking / DFS / BFS | [discuss](https://discuss.leetcode.com/topic/99881/c-backtrack-easy-to-understand) |
| 303 | [Range Sum Query - Immutable](https://leetcode.com/problems/range-sum-query-immutable/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/303.%20Range%20Sum%20Query%20-%20Immutable.cpp) | Easy | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/104447/7-lines-c-dp) |
| 304 | [Range Sum Query 2D - Immutable](https://leetcode.com/problems/range-sum-query-2d-immutable/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/304.%20Range%20Sum%20Query%202D%20-%20Immutable.cpp) | Medium | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/104453/7-lines-c-dp) |
| 305 | [Number of Islands II](https://leetcode.com/problems/number-of-islands-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/305.%20Number%20of%20Islands%20II.cpp) | Hard | Union Find | [discuss](https://discuss.leetcode.com/topic/107415/clean-c-union-find) |
| 307 | [Range Sum Query - Mutable](https://leetcode.com/problems/range-sum-query-mutable/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/307.%20Range%20Sum%20Query%20-%20Mutable.cpp) | Medium | Segment Tree | [discuss](https://discuss.leetcode.com/topic/104511/c-749ms-brute-force) |
| 309 | [Best Time to Buy and Sell Stock with Cooldown](https://leetcode.com/problems/best-time-to-buy-and-sell-stock-with-cooldown/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/309.%20Best%20Time%20to%20Buy%20and%20Sell%20Stock%20with%20Cooldown.cpp) | Medium | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/108594/share-my-6ms-c-dp-solution) |
| 310 | [Minimum Height Trees](https://leetcode.com/problems/minimum-height-trees/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/310.%20Minimum%20Height%20Trees.cpp) | Medium | BFS/ Graph | [discuss](https://discuss.leetcode.com/topic/100685/c-from-bf-1880ms-to-o-n-35ms-beats-99-with-explanation) |
| 311 | [Sparse Matrix Multiplication](https://leetcode.com/problems/sparse-matrix-multiplication/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/311.%20Sparse%20Matrix%20Multiplication.cpp) | Medium | Matrix | [discuss](https://discuss.leetcode.com/topic/98234/clean-10-lines-c) |
| 313 | [Super Ugly Number](https://leetcode.com/problems/super-ugly-number/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/313.%20Super%20Ugly%20Number.cpp) | Medium | Dynamic Programming / Math | [discuss](https://discuss.leetcode.com/topic/102178/clean-9-lines-c) |
| 314 | [Binary Tree Vertical Order Traversal](https://leetcode.com/problems/binary-tree-vertical-order-traversal/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/314.%20Binary%20Tree%20Vertical%20Order%20Traversal.cpp) | Medium | BFS | [discuss](https://discuss.leetcode.com/topic/99884/clean-3-ms-bfs-c) |
| 315 | [Count of Smaller Numbers After Self](https://leetcode.com/problems/count-of-smaller-numbers-after-self/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/315.%20Count%20of%20Smaller%20Numbers%20After%20Self.cpp) | Hard | Divide and Conqur / Binary Search Tree | [discuss](https://discuss.leetcode.com/topic/107641/c-bst) |
| 317 | [Shortest Distance from All Buildings](https://leetcode.com/problems/shortest-distance-from-all-buildings/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/317.%20Shortest%20Distance%20from%20All%20Buildings.cpp) | Hard | BFS | [discuss](https://discuss.leetcode.com/topic/107548/clean-c-bfs) |
| 318 | [Maximum Product of Word Lengths](https://leetcode.com/problems/maximum-product-of-word-lengths/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/318.%20Maximum%20Product%20of%20Word%20Lengths.cpp) | Medium | Bit Manipulation | [discuss](https://discuss.leetcode.com/topic/97533/two-clean-solutions-c) |
| 323 | [Number of Connected Components in an Undirected Graph](https://leetcode.com/problems/number-of-connected-components-in-an-undirected-graph/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/323.%20Number%20of%20Connected%20Components%20in%20an%20Undirected%20Graph.cpp) | Medium | Graph / Union Find / BFS / DFS | [discuss](https://discuss.leetcode.com/topic/105915/c-dfs-and-bfs-solution) |
| 325 | [Maximum Size Subarray Sum Equals k](https://leetcode.com/problems/maximum-size-subarray-sum-equals-k/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/325.%20Maximum%20Size%20Subarray%20Sum%20Equals%20k.cpp) | Medium | Array / Hash Table | [discuss](https://discuss.leetcode.com/topic/99871/10-lines-c-o-n) |
| 329 | [Longest Increasing Path in a Matrix](https://leetcode.com/problems/longest-increasing-path-in-a-matrix/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/329.%20Longest%20Increasing%20Path%20in%20a%20Matrix.cpp) | Hard | DFS / Memorization | [discuss](https://discuss.leetcode.com/topic/80223/clean-c-29ms-dp-solution-beats-96-39) |
| 331 | [Verify Preorder Serialization of a Binary Tree](https://leetcode.com/problems/verify-preorder-serialization-of-a-binary-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/331.%20Verify%20Preorder%20Serialization%20of%20a%20Binary%20Tree.cpp) | Medium | Stack | [discuss](https://discuss.leetcode.com/topic/105906/6ms-c-using-stack) |
| 332 | [Reconstruct Itinerary](https://leetcode.com/problems/reconstruct-itinerary/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/332.%20Reconstruct%20Itinerary.cpp) | Medium | Graph / DFS | [discuss](https://discuss.leetcode.com/topic/107397/c-min-heap) |
| 333 | [Largest BST Subtree](https://leetcode.com/problems/largest-bst-subtree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/333.%20Largest%20BST%20Subtree.cpp) | Medium | Tree | [discuss](https://leetcode.com/problems/largest-bst-subtree/discuss/116233/9-lines-12ms-C++-O(n)-solution) |
| 334 | [Increasing Triplet Subsequence](https://leetcode.com/problems/increasing-triplet-subsequence/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/334.%20Increasing%20Triplet%20Subsequence.cpp) | Medium | Array | [discuss](https://discuss.leetcode.com/topic/97462/straight-forward-c-o-n-time-o-1-space-with-comments) |
| 336 | [Palindrome Pairs](https://leetcode.com/problems/palindrome-pairs/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/336.%20Palindrome%20Pairs.cpp) | Hard | Hash Table / String / Trie | [discuss](https://discuss.leetcode.com/topic/107615/short-c-trie) |
| 339 | [Nested List Weight Sum](https://leetcode.com/problems/nested-list-weight-sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/339.%20Nested%20List%20Weight%20Sum.cpp) | Easy | DFS | [discuss](https://leetcode.com/problems/nested-list-weight-sum/discuss/121963/Simple-5-lines-C++) |
| 340 | [Longest Substring with At Most K Distinct Characters](https://leetcode.com/problems/longest-substring-with-at-most-k-distinct-characters/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/340.%20Longest%20Substring%20with%20At%20Most%20K%20Distinct%20Characters.cpp) | Hard | Hash Table / String | [discuss](https://discuss.leetcode.com/topic/104376/easy-8-lines-c-o-n) |
| 341 | [Flatten Nested List Iterator](https://leetcode.com/problems/flatten-nested-list-iterator/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/341.%20Flatten%20Nested%20List%20Iterator.cpp) | Medium | Stack / Design | [discuss](https://discuss.leetcode.com/topic/97644/short-c-16ms-using-deque) |
| 344 | [Reverse String](https://leetcode.com/problems/reverse-string/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/344.%20Reverse%20String.cpp) | Easy | String | [discuss](https://discuss.leetcode.com/topic/77597/simple-c-9ms-solution) |
| 347 | [Top K Frequent Elements](https://leetcode.com/problems/top-k-frequent-elements/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/347.%20Top%20K%20Frequent%20Elements.cpp) | Medium | Hash Table / Heap | [discuss](https://discuss.leetcode.com/topic/95435/7-lines-c-o-nlogn-solutions-maxheap-minheap) |
| 348 | [Design Tic-Tac-Toe](https://leetcode.com/problems/design-tic-tac-toe/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/348.%20Design%20Tic-Tac-Toe.cpp) | Medium | Design | [discuss](https://discuss.leetcode.com/topic/106788/26ms-c-easy-to-understand) |
| 351 | [Android Unlock Patterns](https://leetcode.com/problems/android-unlock-patterns/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/351.%20Android%20Unlock%20Patterns.cpp) | Medium | DFS / Dynamic Programming | [discuss](https://leetcode.com/problems/android-unlock-patterns/discuss/198845/C++-dfs-easy-to-understand) |
| 354 | [Russian Doll Envelopes](https://leetcode.com/problems/russian-doll-envelopes/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/354.%20Russian%20Doll%20Envelopes.cpp) | Hard | Binary Search / Dynamic Programming | [discuss](https://leetcode.com/problems/russian-doll-envelopes/discuss/134395/10-lines-C++) |
| 355 | [Design Twitter](https://leetcode.com/problems/design-twitter/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/355.%20Design%20Twitter.cpp) | Medium | Hash Table / Design | [discuss](https://discuss.leetcode.com/topic/82459/simple-11-lines-c-o-n-solution) |
| 359 | [Logger Rate Limiter](https://leetcode.com/problems/logger-rate-limiter/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/359.%20Logger%20Rate%20Limiter.cpp) | Easy | Hash Table / Design ||
| 360 | [Sort Transformed Array](https://leetcode.com/problems/sort-transformed-array/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/360.%20Sort%20Transformed%20Array.cpp) | Medium | Math / Two Pointers | [discuss](https://discuss.leetcode.com/topic/107606/short-c-o-n-easy-to-understand) |
| 361 | [Bomb Enemy](https://leetcode.com/problems/bomb-enemy/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/361.%20Bomb%20Enemy.cpp) | Medium | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/104340/clean-c-direction-based-solution) |
| 362 | [Design Hit Counter](https://leetcode.com/problems/design-hit-counter/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/362.%20Design%20Hit%20Counter.cpp) | Medium | Design | [discuss](https://discuss.leetcode.com/topic/105787/4-lines-c) |
| 364 | [Nested List Weight Sum II](https://leetcode.com/problems/nested-list-weight-sum-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/364.%20Nested%20List%20Weight%20Sum%20II.cpp) | Medium | DFS | [discuss](https://leetcode.com/problems/nested-list-weight-sum-ii/discuss/121967/10-lines-C++-recursion) |
| 369 | [Plus One Linked List](https://leetcode.com/problems/plus-one-linked-list/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/369.%20Plus%20One%20Linked%20List.cpp) | Medium | Linked List | [discuss](https://discuss.leetcode.com/topic/105864/simple-c-reverse-list-and-add) |
| 373 | [Find K Pairs with Smallest Sums](https://leetcode.com/problems/find-k-pairs-with-smallest-sums/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/373.%20Find%20K%20Pairs%20with%20Smallest%20Sums.cpp) | Medium | Heap | [discuss](https://discuss.leetcode.com/topic/106033/7-lines-c-minheap-and-maxheap) |
| 377 | [Combination Sum IV](https://leetcode.com/problems/combination-sum-iv/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/377.%20Combination%20Sum%20IV.cpp) | Medium | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/100273/c-recursion) |
| 378 | [Kth Smallest Element in a Sorted Matrix](https://leetcode.com/problems/kth-smallest-element-in-a-sorted-matrix/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/378.%20Kth%20Smallest%20Element%20in%20a%20Sorted%20Matrix.cpp) | Medium | Binary Search / Heap | [discuss](https://discuss.leetcode.com/topic/105997/5-lines-c-minheap-and-multiset) |
| 380 | [Insert Delete GetRandom O(1)](https://leetcode.com/problems/insert-delete-getrandom-o1/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/380.%20Insert%20Delete%20GetRandom%20O(1).cpp) | Medium | Hash Table / Design | [discuss](https://discuss.leetcode.com/topic/104313/10-lines-c-92ms) |
| 382 | [Linked List Random Node](https://leetcode.com/problems/linked-list-random-node/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/382.%20Linked%20List%20Random%20Node.cpp) | Medium | Reservoir Sampling | [discuss](https://discuss.leetcode.com/topic/106031/c-reservoir-sampling) |
| 394 | [Decode String](https://leetcode.com/problems/decode-string/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/394.%20Decode%20String.cpp) | Medium | String / DFS | [discuss](https://discuss.leetcode.com/topic/104396/c-0ms-recursion) |
| 398 | [Random Pick Index](https://leetcode.com/problems/random-pick-index/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/398.%20Random%20Pick%20Index.cpp) | Medium | Reservoir Sampling | [discuss](https://discuss.leetcode.com/topic/101489/my-c-solutions) |
| 399 | [Evaluate Division](https://leetcode.com/problems/evaluate-division/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/399.%20Evaluate%20Division.cpp) | Medium | Graph | [discuss](https://discuss.leetcode.com/topic/105762/clean-3ms-c-bfs) |
| 402 | [Remove K Digits](https://leetcode.com/problems/remove-k-digits/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/402.%20Remove%20K%20Digits.cpp) | Medium | Greedy | [discuss](https://discuss.leetcode.com/topic/105966/my-c-o-n-solution) |
| 404 | [Sum of Left Leaves](https://leetcode.com/problems/sum-of-left-leaves/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/404.%20Sum%20of%20Left%20Leaves.cpp) | Easy | Tree | [discuss](https://discuss.leetcode.com/topic/91207/2-lines-c-dfs) |
| 408 | [Valid Word Abbreviation](https://leetcode.com/problems/valid-word-abbreviation/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/408.%20Valid%20Word%20Abbreviation.cpp) | Easy | String | [discuss](https://discuss.leetcode.com/topic/108894/short-c-solution) |
| 409 | [Longest Palindrome](https://leetcode.com/problems/longest-palindrome/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/409.%20Longest%20Palindrome.cpp) | Easy | Hash Table | [discuss](https://discuss.leetcode.com/topic/109840/4-lines-c) |
| 411 | [Minimum Unique Word Abbreviation](https://leetcode.com/problems/minimum-unique-word-abbreviation/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/411.%20Minimum%20Unique%20Word%20Abbreviation.cpp) | Hard | Backtracking | [discuss](https://discuss.leetcode.com/topic/108917/c-dfs-solution-not-easy-to-understand) |
| 412 | [Fizz Buzz](https://leetcode.com/problems/fizz-buzz/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/412.%20Fizz%20Buzz.cpp) | Easy | Array | [discuss](https://discuss.leetcode.com/topic/85930/c-3ms) |
| 416 | [Partition Equal Subset Sum](https://leetcode.com/problems/partition-equal-subset-sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/416.%20Partition%20Equal%20Subset%20Sum.cpp) | Medium | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/108717/9-lines-c-dp) |
| 417 | [Pacific Atlantic Water Flow](https://leetcode.com/problems/pacific-atlantic-water-flow/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/417.%20Pacific%20Atlantic%20Water%20Flow.cpp) | Medium | DFS / BFS | [discuss](https://discuss.leetcode.com/topic/105705/c-dfs-easy-to-understand) |
| 418 | [Sentence Screen Fitting](https://leetcode.com/problems/sentence-screen-fitting/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/418.%20Sentence%20Screen%20Fitting.cpp) | Medium | Dynamic Programming ||
| 433 | [Minimum Genetic Mutation](https://leetcode.com/problems/minimum-genetic-mutation/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/433.%20Minimum%20Genetic%20Mutation.cpp) | Medium | BFS | [discuss](https://discuss.leetcode.com/topic/101984/clean-c-bfs-same-as-word-ladder) |
| 435 | [Non-overlapping Intervals](https://leetcode.com/problems/non-overlapping-intervals/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/435.%20Non-overlapping%20Intervals.cpp) | Medium | Greedy | [discuss](https://leetcode.com/problems/non-overlapping-intervals/discuss/116085/11-lines-C++) |
| 436 | [Find Right Interval](https://leetcode.com/problems/find-right-interval/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/436.%20Find%20Right%20Interval.cpp) | Medium | Array / Binary Search | [discuss](https://leetcode.com/problems/find-right-interval/discuss/116073/8-lines-C++) |
| 438 | [Find All Anagrams in a String](https://leetcode.com/problems/find-all-anagrams-in-a-string/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/438.%20Find%20All%20Anagrams%20in%20a%20String.cpp) | Easy | Hash Table | [discuss](https://discuss.leetcode.com/topic/111121/12-lines-c-o-n-solution) |
| 441 | [Arranging Coins](https://leetcode.com/problems/arranging-coins/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/441.%20Arranging%20Coins.cpp) | Easy | Math | [discuss](https://discuss.leetcode.com/topic/92001/3-lines-c-easy-to-understand) |
| 444 | [Sequence Reconstruction](https://leetcode.com/problems/sequence-reconstruction/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/444.%20Sequence%20Reconstruction.cpp) | Medium | Graph / Topological Sort | [discuss](https://discuss.leetcode.com/topic/108886/short-c-topological-sort-solution-easy-to-understand) |
| 450 | [Delete Node in a BST](https://leetcode.com/problems/delete-node-in-a-bst/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/450.%20Delete%20Node%20in%20a%20BST.cpp) | Medium | Tree | [discuss](https://leetcode.com/problems/delete-node-in-a-bst/discuss/137641/10-lines-C++) |
| 451 | [Sort Characters By Frequency](https://leetcode.com/problems/sort-characters-by-frequency/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/451.%20Sort%20Characters%20By%20Frequency.cpp) | Medium | Hash Table / Heap | [discuss](https://discuss.leetcode.com/topic/106967/c-o-nlogn-hash-table-priority_queue) |
| 461 | [Hamming Distance](https://leetcode.com/problems/hamming-distance/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/461.%20Hamming%20Distance.cpp) | Easy | Bit Manipulation | [discuss](https://discuss.leetcode.com/topic/85931/4-lines-c-3ms) |
| 467 | [Unique Substrings in Wraparound String](https://leetcode.com/problems/unique-substrings-in-wraparound-string/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/467.%20Unique%20Substrings%20in%20Wraparound%20String.cpp) | Medium | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/104587/9-lines-c) |
| 473 | [Matchsticks to Square](https://leetcode.com/problems/matchsticks-to-square/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/473.%20Matchsticks%20to%20Square.cpp) | Medium | DFS | [discuss](https://discuss.leetcode.com/topic/119716/c-17ms-dfs-solution) |
| 477 | [Total Hamming Distance](https://leetcode.com/problems/total-hamming-distance/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/477.%20Total%20Hamming%20Distance.cpp) | Medium | Bit Manipulation | [discuss](https://discuss.leetcode.com/topic/100420/7-lines-c-o-n) |
| 482 | [License Key Formatting](https://leetcode.com/problems/license-key-formatting/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/482.%20License%20Key%20Formatting.cpp) | Medium | Array | [discuss](https://discuss.leetcode.com/topic/104317/9ms-straight-forward-c) |
| 484 | [Find Permutation](https://leetcode.com/problems/find-permutation/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/484.%20Find%20Permutation.cpp) | Medium | Greedy | [discuss](https://discuss.leetcode.com/topic/105887/9-lines-c) |
| 486 | [Predict the Winner](https://leetcode.com/problems/predict-the-winner/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/486.%20Predict%20the%20Winner.cpp) | Medium | Dynamic Programming / Minimax | [discuss](https://leetcode.com/problems/predict-the-winner/discuss/197984/C++-0ms-minimax) |
| 487 | [Max Consecutive Ones II](https://leetcode.com/problems/max-consecutive-ones-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/487.%20Max%20Consecutive%20Ones%20II.cpp) | Medium | Two Pointers | [discuss](https://leetcode.com/problems/max-consecutive-ones-ii/discuss/122406/7-lines-C++-two-pointers) |
| 489 | [Robot Room Cleaner](https://leetcode.com/problems/robot-room-cleaner/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/489.%20Robot%20Room%20Cleaner.cpp) | Hard | DFS | [discuss](https://leetcode.com/problems/robot-room-cleaner/discuss/199348/C++-dfs-easy-to-understand) |
| 490 | [The Maze](https://leetcode.com/problems/the-maze/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/490.%20The%20Maze.cpp) | Medium | BFS / DFS | |
| 494 | [Target Sum](https://leetcode.com/problems/target-sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/494.%20Target%20Sum.cpp) | Medium | Backtracking | [discuss](https://discuss.leetcode.com/topic/100319/clean-c-backtrack-dp) |
| 496 | [Next Greater Element I](https://leetcode.com/problems/next-greater-element-i/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/496.%20Next%20Greater%20Element%20I.cpp) | Easy | Stack | [discuss](https://discuss.leetcode.com/topic/91234/c-o-n-time-o-1-space) |
| 498 | [Diagonal Traverse](https://leetcode.com/problems/diagonal-traverse/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/498.%20Diagonal%20Traverse.cpp) | Medium | Matrix | [discuss](https://discuss.leetcode.com/topic/105869/clean-c-recursion) |
| 499 | [The Maze III](https://leetcode.com/problems/the-maze-iii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/499.%20The%20Maze%20III.cpp) | Hard | DFS / BFS ||
| 503 | [Next Greater Element II](https://leetcode.com/problems/next-greater-element-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/503.%20Next%20Greater%20Element%20II.cpp) | Medium | Stack | [discuss](https://discuss.leetcode.com/topic/105963/c-from-o-n-2-to-o-n) |
| 505 | [The Maze II](https://leetcode.com/problems/the-maze-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/505.%20The%20Maze%20II.cpp) | Medium | DFS / BFS | [discuss](https://discuss.leetcode.com/topic/104907/c-dfs-direction-based-solution) |
| 508 | [Most Frequent Subtree Sum](https://leetcode.com/problems/most-frequent-subtree-sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/508.%20Most%20Frequent%20Subtree%20Sum.cpp) | Medium | Tree / Hash Table | [discuss](https://discuss.leetcode.com/topic/109583/concise-c-13ms-o-n-solution) |
| 513 | [Find Bottom Left Tree Value](https://leetcode.com/problems/find-bottom-left-tree-value/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/513.%20Find%20Bottom%20Left%20Tree%20Value.cpp) | Medium | Tree / BFS / DFS | [discuss](https://discuss.leetcode.com/topic/109496/8-lines-c-dfs-solution) |
| 515 | [Find Largest Value in Each Tree Row](https://leetcode.com/problems/find-largest-value-in-each-tree-row/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/515.%20Find%20Largest%20Value%20in%20Each%20Tree%20Row.cpp) | Medium | Tree / BFS / DFS | [discuss](https://discuss.leetcode.com/topic/109495/c-bfs-and-dfs-solutions) |
| 523 | [Continuous Subarray Sum](https://leetcode.com/problems/continuous-subarray-sum/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/523.%20Continuous%20Subarray%20Sum.cpp) | Medium | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/101395/share-my-not-too-long-c-solution) |
| 524 | [Longest Word in Dictionary through Deleting](https://leetcode.com/problems/longest-word-in-dictionary-through-deleting/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/524.%20Longest%20Word%20in%20Dictionary%20through%20Deleting.cpp) | Medium | Two Pointers | [discuss](https://discuss.leetcode.com/topic/105780/simple-c-move-pointers-beats-90) |
| 525 | [Contiguous Array](https://leetcode.com/problems/contiguous-array/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/525.%20Contiguous%20Array.cpp) | Medium | Hash Table | [discuss](https://discuss.leetcode.com/topic/100412/10-lines-c) |
| 531 | [Lonely Pixel I](https://leetcode.com/problems/lonely-pixel-i/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/531.%20Lonely%20Pixel%20I.cpp) | Medium | Array / DFS | [discuss](https://discuss.leetcode.com/topic/107379/simple-c-56ms-99-62) |
| 535 | [Encode and Decode TinyURL](https://leetcode.com/problems/encode-and-decode-tinyurl/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/535.%20Encode%20and%20Decode%20TinyURL.cpp) | Medium | String | [discuss](https://discuss.leetcode.com/topic/101377/short-c) |
| 536 | [Construct Binary Tree from String](https://leetcode.com/problems/construct-binary-tree-from-string/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/536.%20Construct%20Binary%20Tree%20from%20String.cpp) | Medium | String / Tree | [discuss](https://discuss.leetcode.com/topic/104659/short-c-recursive) |
| 538 | [Convert BST to Greater Tree](https://leetcode.com/problems/convert-bst-to-greater-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/538.%20Convert%20BST%20to%20Greater%20Tree.cpp) | Easy | DFS | [discuss](https://discuss.leetcode.com/topic/100522/7-lines-c-dfs) |
| 540 | [Single Element in a Sorted Array](https://leetcode.com/problems/single-element-in-a-sorted-array/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/540.%20Single%20Element%20in%20a%20Sorted%20Array.cpp) | Medium | Array / Binary Search | [discuss](https://discuss.leetcode.com/topic/100529/c-9-lines-binary-seach) |
| 541 | [Reverse String II](https://leetcode.com/problems/reverse-string-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/542.%2001%20Matrix.cpp) | Easy | String | [discuss](https://leetcode.com/problems/reverse-string-ii/discuss/129632/4-lines-C++) |
| 542 | [01 Matrix](https://leetcode.com/problems/01-matrix/description/) | [C++](https://github.com/fengvyi/LeetCode/blob/master/C%2B%2B/542.%2001%20Matrix.cpp) | Medium | BFS / DFS | [discuss](https://discuss.leetcode.com/topic/105984/c-bfs) |
| 543 | [Diameter of Binary Tree](https://leetcode.com/problems/diameter-of-binary-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/543.%20Diameter%20of%20Binary%20Tree.cpp) | Easy | Tree | [discuss](https://discuss.leetcode.com/topic/94276/c-6-lines-dfs) |
| 547 | [Friend Circles](https://leetcode.com/problems/friend-circles/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/547.%20Friend%20Circles.cpp) | Medium | DFS / Union Find | [discuss](https://discuss.leetcode.com/topic/100552/c-26ms-dfs-easy-to-understand) |
| 549 | [Binary Tree Longest Consecutive Sequence II](https://leetcode.com/problems/binary-tree-longest-consecutive-sequence-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/549.%20Binary%20Tree%20Longest%20Consecutive%20Sequence%20II.cpp) | Medium | Tree | [discuss](https://discuss.leetcode.com/topic/107340/13-lines-c-post-order-traversal) |
| 554 | [Brick Wall](https://leetcode.com/problems/brick-wall/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/554.%20Brick%20Wall.cpp) | Medium | Hash Table | [discuss](https://discuss.leetcode.com/topic/100401/c-hash-table-easy-to-understand) |
| 556 | [Next Greater Element III](https://leetcode.com/problems/next-greater-element-iii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/556.%20Next%20Greater%20Element%20III.cpp) | Medium | String ||
| 560 | [Subarray Sum Equals K](https://leetcode.com/problems/subarray-sum-equals-k/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/560.%20Subarray%20Sum%20Equals%20K.cpp) | Medium | Array / Map | [discuss](https://discuss.leetcode.com/topic/100697/simple-9-lines-c) |
| 562 | [Longest Line of Consecutive One in Matrix](https://leetcode.com/problems/longest-line-of-consecutive-one-in-matrix/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/562.%20Longest%20Line%20of%20Consecutive%20One%20in%20Matrix.cpp) | Medium | Array | [discuss](https://discuss.leetcode.com/topic/106782/share-my-12-lines-c) |
| 565 | [Array Nesting](https://leetcode.com/problems/array-nesting/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/565.%20Array%20Nesting.cpp) | Medium | Array | [discuss](https://discuss.leetcode.com/topic/100545/c-29ms-dfs-o-n) |
| 566 | [Reshape the Matrix](https://leetcode.com/problems/reshape-the-matrix/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/566.%20Reshape%20the%20Matrix.cpp) | Easy | Array | [discuss](https://discuss.leetcode.com/topic/92281/c-easy-to-understand-beats-90-72) |
| 567 | [Permutation in String](https://leetcode.com/problems/permutation-in-string/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/567.%20Permutation%20in%20String.cpp) | Medium | Two Pointers | [discuss](https://leetcode.com/problems/permutation-in-string/discuss/133527/12-lines-C++) |
| 572 | [Subtree of Another Tree](https://leetcode.com/problems/subtree-of-another-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/572.%20Subtree%20of%20Another%20Tree.cpp) | Easy | Tree | [discuss](https://discuss.leetcode.com/topic/101381/6-lines-c-dfs) |
| 582 | [Kill Process](https://leetcode.com/problems/kill-process/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/582.%20Kill%20Process.cpp) | Medium | Tree / BFS / DFS | [discuss](https://discuss.leetcode.com/topic/109587/c-bfs-and-dfs-solutions) |
| 583 | [Delete Operation for Two Strings](https://leetcode.com/problems/delete-operation-for-two-strings/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/583.%20Delete%20Operation%20for%20Two%20Strings.cpp) | Medium | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/101563/c-6-lines-dp) |
| 599 | [Minimum Index Sum of Two Lists](https://leetcode.com/problems/minimum-index-sum-of-two-lists/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/599.%20Minimum%20Index%20Sum%20of%20Two%20Lists.cpp) | Easy | Hash Table | [discuss](https://discuss.leetcode.com/topic/92782/c-9-lines-hash-table-easy-to-understand) |
| 606 | [Construct String from Binary Tree](https://leetcode.com/problems/construct-string-from-binary-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/606.%20Construct%20String%20from%20Binary%20Tree.cpp) | Easy | Tree / String | [discuss](https://discuss.leetcode.com/topic/93023/6-lines-c-recursion) |
| 611 | [Valid Triangle Number](https://leetcode.com/problems/valid-triangle-number/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/611.%20Valid%20Triangle%20Number.cpp) | Medium | Array | [discuss](https://leetcode.com/problems/valid-triangle-number/discuss/122396/7-lines-C++-brute-force) |
| 616 | [Add Bold Tag in String](https://leetcode.com/problems/add-bold-tag-in-string/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/616.%20Add%20Bold%20Tag%20in%20String.cpp) | Medium | String | [disucss](https://discuss.leetcode.com/topic/105757/c-trie) |
| 621 | [Task Scheduler](https://leetcode.com/problems/task-scheduler/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/621.%20Task%20Scheduler.cpp) | Medium | Array / Queue | [discuss](https://discuss.leetcode.com/topic/100438/c-priority_queue) |
| 632 | [Smallest Range](https://leetcode.com/problems/smallest-range/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/632.%20Smallest%20Range.cpp) | Hard | Two Pointers | [discuss](https://discuss.leetcode.com/topic/108083/c-min-heap) |
| 633 | [Sum of Square Numbers](https://leetcode.com/problems/sum-of-square-numbers/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/633.%20Sum%20of%20Square%20Numbers.cpp) | Easy | Math | [discuss](https://discuss.leetcode.com/topic/112742/3-lines-c-o-sqrt-n-solution) |
| 635 | [Design Log Storage System](https://leetcode.com/problems/design-log-storage-system/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/635.%20Design%20Log%20Storage%20System.cpp) | Medium | String / Design | [discuss](https://leetcode.com/problems/design-log-storage-system/discuss/137402/12-lines-C++) |
| 636 | [Exclusive Time of Functions](https://leetcode.com/problems/exclusive-time-of-functions/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/636.%20Exclusive%20Time%20of%20Functions.cpp) | Medium | Stack | [discuss](https://discuss.leetcode.com/topic/104296/clear-c-stack-easy-to-understand) |
| 637 | [Average of Levels in Binary Tree](https://leetcode.com/problems/average-of-levels-in-binary-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/637.%20Average%20of%20Levels%20in%20Binary%20Tree.cpp) | Easy | BFS | [discuss](https://discuss.leetcode.com/topic/100446/c-typical-bfs) |
| 639 | [Decode Ways II](https://leetcode.com/problems/decode-ways-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/639.%20Decode%20Ways%20II.cpp) | Hard | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/103455/c-59ms-ac-solution-feel-the-power-of-if-else) |
| 642 | [Design Search Autocomplete System](https://leetcode.com/problems/design-search-autocomplete-system/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/642.%20Design%20Search%20Autocomplete%20System.cpp) | Hard | Design / Trie | [discuss](https://leetcode.com/problems/design-search-autocomplete-system/discuss/133933/C++-Trie-and-priority_queue) |
| 643 | [Maximum Average Subarray I](https://leetcode.com/problems/maximum-average-subarray-i/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/643.%20Maximum%20Average%20Subarray%20I.cpp) | Easy | Array | [discuss](https://discuss.leetcode.com/topic/109366/simple-c-o-n-solution) |
| 645 | [Set Mismatch](https://leetcode.com/problems/set-mismatch/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/645.%20Set%20Mismatch.cpp) | Easy | Hash Table / Math | [discuss](https://discuss.leetcode.com/topic/119656/5-lines-c)
| 647 | [Palindromic Substrings](https://leetcode.com/problems/palindromic-substrings/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/647.%20Palindromic%20Substrings.cpp) | Medium | String | [discuss](https://discuss.leetcode.com/topic/101542/8-lines-c-bf) |
| 648 | [Replace Words](https://leetcode.com/problems/replace-words/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/648.%20Replace%20Words.cpp) | Medium | Hash Table / Trie | [discuss](https://discuss.leetcode.com/topic/119431/14-lines-c-with-hash-table) |
| 652 | [Find Duplicate Subtrees](https://leetcode.com/problems/find-duplicate-subtrees/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/652.%20Find%20Duplicate%20Subtrees.cpp) | Medium | Tree | [discuss](https://discuss.leetcode.com/topic/107155/8-lines-c) |
| 653 | [Two Sum IV - Input is a BST](https://leetcode.com/problems/two-sum-iv-input-is-a-bst/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/653.%20Two%20Sum%20IV%20-%20Input%20is%20a%20BST.cpp) | Easy | DFS | [discuss](https://discuss.leetcode.com/topic/100517/6-lines-c) |
| 654 | [Maximum Binary Tree](https://leetcode.com/problems/maximum-binary-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/654.%20Maximum%20Binary%20Tree.cpp) | Medium | Tree | [discuss](https://discuss.leetcode.com/topic/107709/8-lines-c-recursion) |
| 657 | [Judge Route Circle](https://leetcode.com/problems/judge-route-circle/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/657.%20Judge%20Route%20Circle.cpp) | Easy | String | [discuss](https://discuss.leetcode.com/topic/106049/6-lines-c) |
| 658 | [Find K Closest Elements](https://leetcode.com/problems/find-k-closest-elements/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/658.%20Find%20K%20Closest%20Elements.cpp) | Medium | Binary Search | [discuss](https://discuss.leetcode.com/topic/106983/7-lines-c) |
| 659 | [Split Array into Consecutive Subsequences](https://leetcode.com/problems/split-array-into-consecutive-subsequences/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/659.%20Split%20Array%20into%20Consecutive%20Subsequences.cpp) | Medium | Greedy | [discuss](https://discuss.leetcode.com/topic/99187/java-o-n-time-o-n-space/27) |
| 662 | [Maximum Width of Binary Tree](https://leetcode.com/problems/maximum-width-of-binary-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/662.%20Maximum%20Width%20of%20Binary%20Tree.cpp) | Medium | Tree / BFS / DFS | [discuss](https://discuss.leetcode.com/topic/109399/3ms-c-bfs-dfs-solutions) |
| 663 | [Equal Tree Partition](https://leetcode.com/problems/equal-tree-partition/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/663.%20Equal%20Tree%20Partition.cpp) | Medium | Tree | [discuss](https://discuss.leetcode.com/topic/109374/c-19ms-o-n-solution-beats-100) |
| 665 | [Non-decreasing Array](https://leetcode.com/problems/non-decreasing-array/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/665.%20Non-decreasing%20Array.cpp) | Easy | Array | [discuss](https://discuss.leetcode.com/topic/106048/short-c-o-n)
| 669 | [Trim a Binary Search Tree](https://leetcode.com/problems/trim-a-binary-search-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/669.%20Trim%20a%20Binary%20Search%20Tree.cpp) | Easy | Tree | [discuss](https://discuss.leetcode.com/topic/107716/5-lines-c) |
| 670 | [Maximum Swap](https://leetcode.com/problems/maximum-swap/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/670.%20Maximum%20Swap.cpp) | Medium | Array / Math | [discuss](https://discuss.leetcode.com/topic/102845/c-bf-easy-to-understand) |
| 671 | [Second Minimum Node In a Binary Tree](https://leetcode.com/problems/second-minimum-node-in-a-binary-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/671.%20Second%20Minimum%20Node%20In%20a%20Binary%20Tree.cpp) | Easy | Tree | [discuss](https://discuss.leetcode.com/topic/109491/6-lines-c-dfs) |
| 673 | [Number of Longest Increasing Subsequence](https://leetcode.com/problems/number-of-longest-increasing-subsequence/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/673.%20Number%20of%20Longest%20Increasing%20Subsequence.cpp) | Medium | Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/104291/c-backtracking-got-tle) |
| 674 | [Longest Continuous Increasing Subsequence](https://leetcode.com/problems/longest-continuous-increasing-subsequence/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/674.%20Longest%20Continuous%20Increasing%20Subsequence.cpp) | Easy | Array | [discuss](https://discuss.leetcode.com/topic/104218/8-lines-c-two-pointers-easy-to-understand) |
| 676 | [Implement Magic Dictionary](https://leetcode.com/problems/implement-magic-dictionary/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/676.%20Implement%20Magic%20Dictionary.cpp) | Medium | Hash Table / Trie | [discuss](https://discuss.leetcode.com/topic/107072/two-c-solutions-hash-table-trie) |
| 677 | [Map Sum Pairs](https://leetcode.com/problems/map-sum-pairs/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/677.%20Map%20Sum%20Pairs.cpp) | Medium | Trie | [discuss](https://leetcode.com/problems/map-sum-pairs/discuss/115244/C++-Trie-+-unordered_map) |
| 679 | [24 Game](https://leetcode.com/problems/24-game/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/679.%2024%20Game.cpp) | Hard | DFS | [discuss](https://leetcode.com/problems/24-game/discuss/198773/C++-dfs-easy-to-understand) |
| 680 | [Valid Palindrome II](https://leetcode.com/problems/valid-palindrome-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/680.%20Valid%20Palindrome%20II.cpp) | Easy | String | [discuss](https://discuss.leetcode.com/topic/104217/6-lines-c-o-n) |
| 681 | [Next Closest Time](https://leetcode.com/problems/next-closest-time/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/681.%20Next%20Closest%20Time.cpp) | Medium | String | [discuss](https://discuss.leetcode.com/topic/105685/3ms-c-dfs) |
| 683 | [K Empty Slots](https://leetcode.com/problems/k-empty-slots/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/683.%20K%20Empty%20Slots.cpp) | Hard | Array / Binary Search | [discuss](https://discuss.leetcode.com/topic/105690/c-binary-search-o-nlogn-easy-to-understand) |
| 684 | [Redundant Connection](https://leetcode.com/problems/redundant-connection/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/684.%20Redundant%20Connection.cpp) | Medium | Graph / Union Find | [discuss](https://discuss.leetcode.com/topic/109834/13ms-c-union-find) |
| 685 | [Redundant Connection II](https://leetcode.com/problems/redundant-connection-ii/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/685.%20Redundant%20Connection%20II.cpp) | Hard | Graph / DFS / Union Find | [discuss](https://leetcode.com/problems/redundant-connection-ii/description/) |
| 686 | [Repeated String Match](https://leetcode.com/problems/repeated-string-match/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/686.%20Repeated%20String%20Match.cpp) | Easy | String | [discuss](https://discuss.leetcode.com/topic/106037/3ms-c-o-n-solution) |
| 687 | [Longest Univalue Path](https://leetcode.com/problems/longest-univalue-path/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/687.%20Longest%20Univalue%20Path.cpp) | Easy | Tree / DFS | [discuss](https://discuss.leetcode.com/topic/106043/simple-c-dfs) |
| 688 | [Knight Probability in Chessboard](https://leetcode.com/problems/knight-probability-in-chessboard/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/688.%20Knight%20Probability%20in%20Chessboard.cpp) |Medium | Dynamic Programming |[discuss](https://leetcode.com/problems/knight-probability-in-chessboard/discuss/115213/C++-memoization-easy-to-understand) |
| 689 | [Maximum Sum of 3 Non-Overlapping Subarrays](https://leetcode.com/problems/maximum-sum-of-3-non-overlapping-subarrays/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/689.%20Maximum%20Sum%20of%203%20Non-Overlapping%20Subarrays.cpp) | Hard | Array / Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/109486/concise-c-dp-solution-with-comments) |
| 690 | [Employee Importance](https://leetcode.com/problems/employee-importance/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/690.%20Employee%20Importance.cpp) | Easy | Hash Table / BFS / DFS | [discuss](https://discuss.leetcode.com/topic/109269/c-12-lines-bfs-and-7-lines-dfs) |
| 692 | [Top K Frequent Words](https://leetcode.com/problems/top-k-frequent-words/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/692.%20Top%20K%20Frequent%20Words.cpp) | Medium | Hash Table / Heap | [discuss](https://discuss.leetcode.com/topic/108091/12-lines-c-min-heap-o-nlogk-solution) |
| 693 | [Binary Number with Alternating Bits](https://leetcode.com/problems/binary-number-with-alternating-bits/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/693.%20Binary%20Number%20with%20Alternating%20Bits.cpp) | Easy | Bit Manipulation | [discuss](https://discuss.leetcode.com/topic/109248/4-lines-c-easy-to-understand) |
| 694 | [Number of Distinct Islands](https://leetcode.com/problems/number-of-distinct-islands/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/694.%20Number%20of%20Distinct%20Islands.cpp) | Medium | Hash Table / DFS | [discuss](https://discuss.leetcode.com/topic/108706/share-my-c-dfs-solution)
| 695 | [Max Area of Island](https://leetcode.com/problems/max-area-of-island/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/695.%20Max%20Area%20of%20Island.cpp) | Easy | Array / DFS | [discuss](https://discuss.leetcode.com/topic/108087/clean-c-dfs) |
| 696 | [Count Binary Substrings](https://leetcode.com/problems/count-binary-substrings/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/696.%20Count%20Binary%20Substrings.cpp) | Easy | String | [discuss](https://discuss.leetcode.com/topic/108103/9-lines-c-easy-to-understand) |
| 697 | [Degree of an Array](https://leetcode.com/problems/degree-of-an-array/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/697.%20Degree%20of%20an%20Array.cpp) | Easy | Array | [discuss](https://discuss.leetcode.com/topic/108702/11-lines-c-o-n-easy-to-understand) |
| 701 | [Insert into a Binary Search Tree](https://leetcode.com/problems/insert-into-a-binary-search-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/701.%20Insert%20into%20a%20Binary%20Search%20Tree.cpp) | Medium | Array ||
| 713 | [Subarray Product Less Than K](https://leetcode.com/problems/subarray-product-less-than-k/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/713.%20Subarray%20Product%20Less%20Than%20K.cpp) | Medium | Array | [discuss](https://discuss.leetcode.com/topic/108700/7-lines-c) |
| 717 | [1-bit and 2-bit Characters](https://leetcode.com/problems/1-bit-and-2-bit-characters/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/717.%201-bit%20and%202-bit%20Characters.cpp) | Easy | Array | [discuss](https://discuss.leetcode.com/topic/109261/simple-3-lines-c) |
| 718 | [Maximum Length of Repeated Subarray](https://leetcode.com/problems/maximum-length-of-repeated-subarray/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/718.%20Maximum%20Length%20of%20Repeated%20Subarray.cpp) | Medium | Array / Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/109413/clean-c-dp-solution) |
| 720 | [Longest Word in Dictionary](https://leetcode.com/problems/longest-word-in-dictionary/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/720.%20Longest%20Word%20in%20Dictionary.cpp) | Easy | Hash Table / Trie | [discuss](https://discuss.leetcode.com/topic/110523/9-lines-c) |
| 723 | [Candy Crush](https://leetcode.com/problems/candy-crush/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/723.%20Candy%20Crush.cpp) | Medium | Array / Two Pointers | [discuss](https://leetcode.com/problems/candy-crush/discuss/200286/C++-easy-to-understand) |
| 724 | [Find Pivot Index](https://leetcode.com/problems/find-pivot-index/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/724.%20Find%20Pivot%20Index.cpp) | Easy | Array | [discuss](https://discuss.leetcode.com/topic/112117/5-lines-c) |
| 725 | [Split Linked List in Parts](https://leetcode.com/problems/split-linked-list-in-parts/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/725.%20Split%20Linked%20List%20in%20Parts.cpp) | Medium | Linked List | [discuss](https://discuss.leetcode.com/topic/110532/9ms-c-solution) |
| 728 | [Self Dividing Numbers](https://leetcode.com/problems/self-dividing-numbers/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/728.%20Self%20Dividing%20Numbers.cpp) | Easy | Math | [discuss](https://discuss.leetcode.com/topic/112665/10-lines-c-easy-to-understand) |
| 729 | [My Calendar I](https://leetcode.com/problems/my-calendar-i/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/729.%20My%20Calendar%20I.cpp) | Medium | Array | [discuss](https://discuss.leetcode.com/topic/112620/5-lines-c-easy-to-understand) |
| 733 | [Flood Fill](https://leetcode.com/problems/flood-fill/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/733.%20Flood%20Fill.cpp) | Easy | DFS | [discuss](https://discuss.leetcode.com/topic/112595/9-lines-c-dfs-solution) |
| 734 | [Sentence Similarity](https://leetcode.com/problems/sentence-similarity/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/734.%20Sentence%20Similarity.cpp) | Easy | Hash Table | [discuss](https://discuss.leetcode.com/topic/112260/9-lines-c-solution) |
| 735 | [Asteroid Collision](https://leetcode.com/problems/asteroid-collision/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/739.%20Daily%20Temperatures.cpp) | Medium | Stack | [discuss](https://discuss.leetcode.com/topic/112590/9-lines-c-solution) |
| 739 | [Daily Temperatures](https://leetcode.com/problems/daily-temperatures/description/) | [C++](https://github.com/fengvyi/LeetCode/blob/master/C%2B%2B/739.%20Daily%20Temperatures.cpp) | Medium | Stack / Hash Table | [discuss](https://discuss.leetcode.com/topic/118570/c-11-lines-o-n-time-space-solution) |
| 740 | [Delete and Earn](https://leetcode.com/problems/delete-and-earn/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/740.%20Delete%20and%20Earn.cpp) | Medium | Dynamic Programming | [discuss](https://leetcode.com/problems/delete-and-earn/discuss/123634/C++-9ms-DP-solution) |
| 742 | [Closest Leaf in a Binary Tree](https://leetcode.com/problems/closest-leaf-in-a-binary-tree/discuss/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/742.%20Closest%20Leaf%20in%20a%20Binary%20Tree.cpp) | Medium | Tree / Graph | [discuss](https://discuss.leetcode.com/topic/120405/share-my-c-bfs-solution) |
| 746 | [Min Cost Climbing Stairs](https://leetcode.com/problems/min-cost-climbing-stairs/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/746.%20Min%20Cost%20Climbing%20Stairs.cpp) | Easy | Array / Dynamic Programming | [discuss](https://discuss.leetcode.com/topic/118024/4-lines-c-o-1-space-dp-solution) |
| 747 | [Largest Number At Least Twice of Others](https://leetcode.com/problems/largest-number-at-least-twice-of-others/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/747.%20Largest%20Number%20At%20Least%20Twice%20of%20Others.cpp) | Easy | Array | [discuss](https://discuss.leetcode.com/topic/118468/c-o-n-time-o-1-space-one-pass-solution) |
| 750 | [Number Of Corner Rectangles](https://leetcode.com/problems/number-of-corner-rectangles/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/750.%20Number%20Of%20Corner%20Rectangles.cpp) | Medium | Dynamic Programming ||
| 753 | [Cracking the Safe](https://leetcode.com/problems/cracking-the-safe/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/753.%20Cracking%20the%20Safe.cpp) | Hard | DFS | |
| 758 | [Bold Words in String](https://leetcode.com/problems/bold-words-in-string/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/758.%20Bold%20Words%20in%20String.cpp) | Easy | String | [discuss](https://leetcode.com/problems/bold-words-in-string/discuss/122324/7ms-C++-solution) |
| 760 | [Find Anagram Mappings](https://leetcode.com/problems/find-anagram-mappings/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/760.%20Find%20Anagram%20Mappings.cpp) | Easy | Hash Table | [discuss](https://discuss.leetcode.com/topic/118029/short-c) |
| 763 | [Partition Labels](https://leetcode.com/problems/partition-labels/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/763.%20Partition%20Labels.cpp) | Medium | Two Pointers / Greedy | [disucss](https://leetcode.com/problems/partition-labels/discuss/115211/C++-O(n)-solution) |
| 765 | [Couples Holding Hands](https://leetcode.com/problems/couples-holding-hands/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/765.%20Couples%20Holding%20Hands.cpp) | Hard | Greedy / Union Find / Greedy | [disucss](https://leetcode.com/problems/couples-holding-hands/discuss/196706/C++-greedy-solution) |
| 766 | [Toeplitz Matrix](https://leetcode.com/problems/toeplitz-matrix/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/766.%20Toeplitz%20Matrix.cpp) | Easy | Array | [discuss](https://discuss.leetcode.com/topic/118466/4-lines-c) |
| 769 | [Max Chunks To Make Sorted](https://leetcode.com/problems/max-chunks-to-make-sorted/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/769.%20Max%20Chunks%20To%20Make%20Sorted.cpp) | Medium | Array | [discuss](https://leetcode.com/problems/max-chunks-to-make-sorted/discuss/115174/Simple-6-lines-C++-solution-with-brief-explanation) |
| 771 | [Jewels and Stones](https://leetcode.com/problems/jewels-and-stones/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/771.%20Jewels%20and%20Stones.cpp) | Easy | Hash Table | [discuss](https://discuss.leetcode.com/topic/119330/5-lines-c) |
| 773 | [Sliding Puzzle](https://leetcode.com/problems/sliding-puzzle/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/773.%20Sliding%20Puzzle.cpp) | Hard | BFS ||
| 777 | [Swap Adjacent in LR String](https://leetcode.com/problems/swap-adjacent-in-lr-string/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/777.%20Swap%20Adjacent%20in%20LR%20String.cpp) | Medium | Brainteaser | [discuss](https://leetcode.com/problems/swap-adjacent-in-lr-string/discuss/199945/C++-easy-to-understand) |
| 779 | [K-th Symbol in Grammar](https://leetcode.com/problems/k-th-symbol-in-grammar/description/) |[C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/779.%20K-th%20Symbol%20in%20Grammar.cpp) | Medium | Recursion | [discuss](https://leetcode.com/problems/k-th-symbol-in-grammar/discuss/115007/One-line-C++) |
| 783 | [Minimum Distance Between BST Nodes](https://leetcode.com/problems/minimum-distance-between-bst-nodes/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/783.%20Minimum%20Distance%20Between%20BST%20Nodes.cpp) | Easy | Tree | [discuss](https://discuss.leetcode.com/topic/120414/c-in-order-traversal-recursive-non-recursive) |
| 784 | [Letter Case Permutation](https://leetcode.com/problems/letter-case-permutation/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/784.%20Letter%20Case%20Permutation.cpp) | Easy | String | [discuss](https://leetcode.com/problems/letter-case-permutation/discuss/115804/Simple-C++-DFS-solution) |
| 785 | [Is Graph Bipartite](https://leetcode.com/problems/is-graph-bipartite/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/785.%20Is%20Graph%20Bipartite.cpp) | Medium | Graph | [discuss](https://leetcode.com/problems/is-graph-bipartite/discuss/115943/12-lines-C++-solution) |
| 787 | [Cheapest Flights Within K Stops](https://leetcode.com/problems/cheapest-flights-within-k-stops/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/787.%20Cheapest%20Flights%20Within%20K%20Stops.cpp) | Medium | Graph / Heap | [discuss](https://leetcode.com/problems/cheapest-flights-within-k-stops/discuss/115853/11-lines-C++-DFS-solution) |
| 791 | [Custom Sort String](https://leetcode.com/problems/all-paths-from-source-to-target/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/791.%20Custom%20Sort%20String.cpp) | Medium | String | [discuss](https://leetcode.com/problems/custom-sort-string/discuss/121132/8-lines-C++-bucket-sort) |
| 792 | [Number of Matching Subsequences](https://leetcode.com/problems/number-of-matching-subsequences/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/792.%20Number%20of%20Matching%20Subsequences.cpp) | Medium | Array | [discuss](https://leetcode.com/problems/number-of-matching-subsequences/discuss/121399/C++-bucket-sort-O(n)-solution) |
| 797 | [All Paths From Source to Target](https://leetcode.com/problems/all-paths-from-source-to-target/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/797.%20All%20Paths%20From%20Source%20to%20Target.cpp) | Medium | DFS / Graph | [discuss](https://leetcode.com/problems/all-paths-from-source-to-target/discuss/121135/6-lines-C++-dfs) |
| 798 | [Smallest Rotation with Highest Score](https://leetcode.com/problems/smallest-rotation-with-highest-score/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/798.%20Smallest%20Rotation%20with%20Highest%20Score.cpp) | Hard | Array | [discuss](https://leetcode.com/problems/smallest-rotation-with-highest-score/discuss/121296/7-lines-C++-solution) |
| 799 | [Champagne Tower](https://leetcode.com/problems/champagne-tower/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/799.%20Champagne%20Tower.cpp) | Medium | Array | [discuss](https://leetcode.com/problems/champagne-tower/discuss/121392/14ms-C++-solution) |
| 802 | [Find Eventual Safe States](https://leetcode.com/problems/find-eventual-safe-states/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/802.%20Find%20Eventual%20Safe%20States.cpp) | Medium | DFS / Graph | [discuss](https://leetcode.com/problems/find-eventual-safe-states/discuss/121012/14-lines-C++-dfs) |
| 803 | [Bricks Falling When Hit](https://leetcode.com/problems/bricks-falling-when-hit/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/803.%20Bricks%20Falling%20When%20Hit.cpp) | Hard | Union Find | [discuss](https://leetcode.com/problems/bricks-falling-when-hit/discuss/200303/C++-dfs-easy-to-understand) |
| 804 | [Unique Morse Code Words](https://leetcode.com/problems/unique-morse-code-words/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/804.%20Unique%20Morse%20Code%20Words.cpp) | Easy | String | [discuss](https://leetcode.com/problems/unique-morse-code-words/discuss/121018/8-lines-C++) |
| 805 | [Split Array With Same Average](https://leetcode.com/problems/split-array-with-same-average/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/805.%20Split%20Array%20With%20Same%20Average.cpp) | Hard | Math ||
| 806 | [Number of Lines To Write String](https://leetcode.com/problems/number-of-lines-to-write-string/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/806.%20Number%20of%20Lines%20To%20Write%20String.cpp) | Easy | String | [discuss](https://leetcode.com/problems/number-of-lines-to-write-string/discuss/121016/6-lines-C++) |
| 807 | [Max Increase to Keep City Skyline](https://leetcode.com/problems/max-increase-to-keep-city-skyline/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/807.%20Max%20Increase%20to%20Keep%20City%20Skyline.cpp) | Medium | Array | [discuss](https://leetcode.com/problems/max-increase-to-keep-city-skyline/discuss/121014/13-lines-C++) |
| 809 | [Expressive Words](https://leetcode.com/problems/expressive-words/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/809.%20Expressive%20Words.cpp) | Medium | String | [discuss](https://leetcode.com/problems/expressive-words/discuss/121990/9ms-C++-intuitive-solution) |
| 814 | [Binary Tree Pruning](https://leetcode.com/problems/binary-tree-pruning/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/814.%20Binary%20Tree%20Pruning.cpp) | Medium | Tree | [discuss](https://leetcode.com/problems/binary-tree-pruning/discuss/133234/4-lines-C++) |
| 815 | [Bus Routes](https://leetcode.com/problems/bus-routes/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/815.%20Bus%20Routes.cpp) | Hard | BFS | [discuss](https://leetcode.com/problems/bus-routes/discuss/193976/C++-BFS-easy-to-understand) |
| 819 | [Most Common Word](https://leetcode.com/problems/most-common-word/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/819.%20Most%20Common%20Word.cpp) | Easy | String | [discuss](https://leetcode.com/problems/most-common-word/discuss/124286/Clean-6ms-C++-solution) |
| 820 | [Short Encoding of Words](https://leetcode.com/problems/short-encoding-of-words/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/820.%20Short%20Encoding%20of%20Words.cpp) | Medium | Trie | [discuss](https://leetcode.com/problems/short-encoding-of-words/discuss/133642/C++-Trie-solution-easy-to-understand) |
| 821 | [Shortest Distance to a Character](https://leetcode.com/problems/shortest-distance-to-a-character/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/821.%20Shortest%20Distance%20to%20a%20Character.cpp) | Easy | String | [discuss](https://leetcode.com/problems/shortest-distance-to-a-character/discuss/126226/7-lines-C++-O(n)-solution) |
| 826 | [Most Profit Assigning Work](https://leetcode.com/problems/most-profit-assigning-work/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/826.%20Most%20Profit%20Assigning%20Work.cpp) | Medium | Two Pointers / Binary Search | [discuss](https://leetcode.com/problems/most-profit-assigning-work/discuss/129241/C++-Sort-+-Binary-Search) |
| 830 | [Positions of Large Groups](https://leetcode.com/problems/positions-of-large-groups/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/830.%20Positions%20of%20Large%20Groups.cpp) | Easy | Array | [discuss](https://leetcode.com/problems/positions-of-large-groups/discuss/129224/8-lines-C++) |
| 832 | [Flipping an Image](https://leetcode.com/problems/flipping-an-image/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/832.%20Flipping%20an%20Image.cpp) | Easy | Array | [discuss](https://leetcode.com/problems/flipping-an-image/discuss/131395/5-lines-C++) |
| 834 | [Sum of Distances in Tree](https://leetcode.com/problems/sum-of-distances-in-tree/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/834.%20Sum%20of%20Distances%20in%20Tree.cpp) | Hard | Tree / DFS | [discuss](https://leetcode.com/problems/sum-of-distances-in-tree/discuss/131472/C++-O(n)-two-pass-solution) |
| 836 | [Rectangle Overlap](https://leetcode.com/problems/rectangle-overlap/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/836.%20Rectangle%20Overlap.cpp) | Easy | Math | [discuss](https://leetcode.com/problems/rectangle-overlap/discuss/133237/Share-my-1-line-C++) |
| 841 | [Keys and Rooms](https://leetcode.com/problems/keys-and-rooms/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/841.%20Keys%20and%20Rooms.cpp) | Medium | DFS / BFS / Graph | [discuss](https://leetcode.com/problems/keys-and-rooms/discuss/134410/Short-C++-DFS-and-BFS-solutions) |
| 843 | [Guess the Word](https://leetcode.com/problems/guess-the-word/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/843.%20Guess%20the%20Word.cpp) | Hard | Minimax ||
| 844 | [Backspace String Compare](https://leetcode.com/problems/backspace-string-compare/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/844.%20Backspace%20String%20Compare.cpp) | Easy | Stack / Two Pointers | [discuss](https://leetcode.com/problems/backspace-string-compare/discuss/135873/8-lines-C++-O(1)-space-easy-to-understand) |
| 845 | [Longest Mountain in Array](https://leetcode.com/problems/longest-mountain-in-array/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/845.%20Longest%20Mountain%20in%20Array.cpp) | Medium | Two Pointers | [discuss](https://leetcode.com/problems/longest-mountain-in-array/discuss/136816/12-lines-C++-two-pointers) |
| 846 | [Hand of Straights](https://leetcode.com/problems/hand-of-straights/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/846.%20Hand%20of%20Straights.cpp) | Medium | Map | [discuss](https://leetcode.com/problems/hand-of-straights/discuss/137090/C++-map-solution) |
| 848 | [Shifting Letters](https://leetcode.com/problems/shifting-letters/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/848.%20Shifting%20Letters.cpp) | Medium | String | [disucss](https://leetcode.com/problems/shifting-letters/discuss/139779/3-lines-C++) |
| 849 | [Maximize Distance to Closest Person](https://leetcode.com/problems/maximize-distance-to-closest-person/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/849.%20Maximize%20Distance%20to%20Closest%20Person.cpp) | Easy | Array | [discuss](https://leetcode.com/problems/maximize-distance-to-closest-person/discuss/138550/3-lines-C++-one-pass) |
| 852 | [Peak Index in a Mountain Array](https://leetcode.com/problems/peak-index-in-a-mountain-array/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/852.%20Peak%20Index%20in%20a%20Mountain%20Array.cpp) | Easy | Binary Search | [disucss](https://leetcode.com/problems/peak-index-in-a-mountain-array/discuss/198506/C++-O(n)-and-O(logn)) |
| 853 | [Car Fleet](https://leetcode.com/problems/car-fleet/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/853.%20Car%20Fleet.cpp) | Medium | Stack ||
| 855 | [Exam Room](https://leetcode.com/problems/exam-room/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/855.%20Exam%20Room.cpp) | Medium | Map | [discuss](https://leetcode.com/problems/exam-room/discuss/199632/C++-set-O(logn)-leave-O(n)-seat) |
| 857 | [Minimum Cost to Hire K Workers](https://leetcode.com/problems/minimum-cost-to-hire-k-workers/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/857.%20Minimum%20Cost%20to%20Hire%20K%20Workers.cpp) | Hard | Heap ||
| 859 | [Buddy Strings](https://leetcode.com/problems/buddy-strings/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/859.%20Buddy%20Strings.cpp) | Easy | String | [discuss](https://leetcode.com/problems/buddy-strings/discuss/142512/13-lines-C++) |
| 872 | [Leaf-Similar Trees](https://leetcode.com/problems/leaf-similar-trees/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/872.%20Leaf-Similar%20Trees.cpp) | Easy | Tree / DFS | [discuss](https://leetcode.com/problems/leaf-similar-trees/discuss/155163/11-lines-C++) |
| 876 | [Middle of the Linked List](https://leetcode.com/problems/middle-of-the-linked-list/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/876.%20Middle%20of%20the%20Linked%20List.cpp) | Easy | Linked List | [disucss](https://leetcode.com/problems/middle-of-the-linked-list/discuss/155173/3-lines-C++) |
| 884 | [Uncommon Words from Two Sentences](https://leetcode.com/problems/uncommon-words-from-two-sentences/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/884.%20Uncommon%20Words%20from%20Two%20Sentences.cpp) | Easy | Hash Table | [discuss](https://leetcode.com/problems/uncommon-words-from-two-sentences/discuss/166163/7-lines-C++) |
| 888 | [Fair Candy Swap](https://leetcode.com/problems/fair-candy-swap/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/888.%20Fair%20Candy%20Swap.cpp) | Easy | Array | [discuss](https://leetcode.com/problems/fair-candy-swap/discuss/166160/6-lines-C++) |
| 889 | [Construct Binary Tree from Preorder and Postorder Traversal](https://leetcode.com/problems/construct-binary-tree-from-preorder-and-postorder-traversal/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/889.%20Construct%20Binary%20Tree%20from%20Preorder%20and%20Postorder%20Traversal.cpp) | Medium | Tree ||
| 890 | [Find and Replace Pattern](https://leetcode.com/problems/find-and-replace-pattern/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/890.%20Find%20and%20Replace%20Pattern.cpp) | Medium | String | [discuss](https://leetcode.com/problems/find-and-replace-pattern/discuss/199645/Two-C++-solutions) |
| 894 | [All Possible Full Binary Trees](https://leetcode.com/problems/all-possible-full-binary-trees/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/894.%20All%20Possible%20Full%20Binary%20Trees.cpp) | Medium | Tree / Recursion ||
| 896 | [Monotonic Array](https://leetcode.com/problems/monotonic-array/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/896.%20Monotonic%20Array.cpp) | Easy | Array | [discuss](https://leetcode.com/problems/monotonic-array/discuss/166156/Short-C++-one-pass) |
| 900 | [RLE Iterator](https://leetcode.com/problems/rle-iterator/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/900.%20RLE%20Iterator.cpp) | Medium | Array ||
| 904 | [Fruit Into Baskets](https://leetcode.com/problems/fruit-into-baskets/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/904.%20Fruit%20Into%20Baskets.cpp) | Medium | Two Pointers ||
| 911 | [Online Election](https://leetcode.com/problems/online-election/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/911.%20Online%20Election.cpp) | Medium | Binary Search / Map ||
| 914 | [X of a Kind in a Deck of Cards](https://leetcode.com/problems/x-of-a-kind-in-a-deck-of-cards/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/914.%20X%20of%20a%20Kind%20in%20a%20Deck%20of%20Cards.cpp) | Easy | Array / Math ||
| 916 | [Word Subsets](https://leetcode.com/problems/word-subsets/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/916.%20Word%20Subsets.cpp) | Medium | String ||
| 925 | [Long Pressed Name](https://leetcode.com/problems/long-pressed-name/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/925.%20Long%20Pressed%20Name.cpp) | Easy | String | [discuss](https://leetcode.com/problems/long-pressed-name/discuss/194718/5-lines-C++) |
| 929 | [Unique Email Addresses](https://leetcode.com/problems/unique-email-addresses/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/929.%20Unique%20Email%20Addresses.cpp) | Easy | String ||
| 932 | [Beautiful Array](https://leetcode.com/problems/beautiful-array/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/932.%20Beautiful%20Array.cpp) | Medium | Divide and Conquer ||
| 933 | [Number of Recent Calls](https://leetcode.com/problems/number-of-recent-calls/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/933.%20Number%20of%20Recent%20Calls.cpp) | Easy | Queue ||
| 935 | [Knight Dialer](https://leetcode.com/problems/knight-dialer/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/935.%20Knight%20Dialer.cpp) | Medium | Dynamic Programming | [discuss](https://leetcode.com/problems/knight-dialer/discuss/192515/Super-easy-to-understand-C++-DP-solution) |
| 938 | [Range Sum of BST](https://leetcode.com/problems/range-sum-of-bst/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/938.%20Range%20Sum%20of%20BST.cpp) | Medium | Tree | [discuss](https://leetcode.com/problems/range-sum-of-bst/discuss/220732/C++-1-line) |
| 939 | [Minimum Area Rectangle](https://leetcode.com/problems/minimum-area-rectangle/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/939.%20Minimum%20Area%20Rectangle.cpp) | Medium | Hash Table | [discuss](https://leetcode.com/problems/minimum-area-rectangle/discuss/219129/C++-set-O(n2)) |
| 941 | [Valid Mountain Array](https://leetcode.com/problems/valid-mountain-array/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/941.%20Valid%20Mountain%20Array.cpp) | Easy | Array ||
| 946 | [Validate Stack Sequences](https://leetcode.com/problems/validate-stack-sequences/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/946.%20Validate%20Stack%20Sequences.cpp) | Medium | Stack ||
| 951 | [Flip Equivalent Binary Trees](https://leetcode.com/problems/flip-equivalent-binary-trees/description/) | [C++](https://github.com/rajeev-ranjan-au6/Leetcode_Cpp/blob/master/951.%20Flip%20Equivalent%20Binary%20Trees.cpp) | Medium | Tree | [discuss](https://leetcode.com/problems/flip-equivalent-binary-trees/discuss/220723/Clean-C++-DFS) |