https://github.com/iamabirakash/leetcode

A repository containing best solutions of daily LeetCode problems
https://github.com/iamabirakash/leetcode

daily-coding-problem leetcode leetcode-java leetcode-python leetcode-solutions

Last synced: 18 days ago
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A repository containing best solutions of daily LeetCode problems

• Host: GitHub
• URL: https://github.com/iamabirakash/leetcode
• Owner: iamabirakash
• Created: 2024-07-07T06:38:09.000Z (about 2 years ago)
• Default Branch: main
• Last Pushed: 2026-06-23T09:25:16.000Z (24 days ago)
• Last Synced: 2026-06-23T12:11:29.757Z (24 days ago)
• Topics: daily-coding-problem, leetcode, leetcode-java, leetcode-python, leetcode-solutions
• Language: C++
• Homepage: https://leetcodehub.netlify.app/
• Size: 955 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# Leetcode

[iamabirakash](https://leetcode.com/u/iamabirakash/)

A topic-wise index of the solution folders in this repository. Some problems appear in multiple sections when they naturally fit more than one pattern.

## Topics

- [Dynamic Programming](#dynamic-programming) (34)

- [Graphs](#graphs) (8)

- [Trees](#trees) (32)

- [Matrix & Grid](#matrix-grid) (22)

- [Strings](#strings) (43)

- [Arrays](#arrays) (76)

- [Linked List](#linked-list) (15)

- [Stack](#stack) (13)

- [Queue](#queue) (2)

- [Heap / Priority Queue](#heap-priority-queue) (4)

- [Sliding Window](#sliding-window) (22)

- [Two Pointers](#two-pointers) (12)

- [Binary Search](#binary-search) (9)

- [Backtracking](#backtracking) (19)

- [Greedy](#greedy) (16)

- [Sorting](#sorting) (19)

- [Hash Table](#hash-table) (16)

- [Prefix Sum](#prefix-sum) (17)

- [Bit Manipulation](#bit-manipulation) (11)

- [Math](#math) (33)

- [Simulation](#simulation) (19)

- [Database / SQL](#database-sql) (1)

## Dynamic Programming

1. [2 Keys Keyboard](2%20Keys%20Keyboard)

2. [Climbing Stairs](Climbing%20Stairs)

3. [climbing-stairs](climbing-stairs)

4. [Coin Change](Coin%20Change)

5. [divisor-game](divisor-game)

6. [DYNAMIC PROGRAMMING / Fibonacci Number](DYNAMIC%20PROGRAMMING/Fibonacci%20Number)

7. [DYNAMIC PROGRAMMING / Friends Pairing Problem](DYNAMIC%20PROGRAMMING/Friends%20Pairing%20Problem)

8. [DYNAMIC PROGRAMMING / House Robbers](DYNAMIC%20PROGRAMMING/House%20Robbers)

9. [DYNAMIC PROGRAMMING / Min Cost Climbing Stairs](DYNAMIC%20PROGRAMMING/Min%20Cost%20Climbing%20Stairs)

10. [DYNAMIC PROGRAMMING / N-th Tribonacci Number](DYNAMIC%20PROGRAMMING/N-th%20Tribonacci%20Number)

11. [Fibonacci Number](Fibonacci%20Number)

12. [fibonacci-number](fibonacci-number)

13. [Filling Bookcase Shelves](Filling%20Bookcase%20Shelves)

14. [Find the Maximum Number of Fruits Collected](Find%20the%20Maximum%20Number%20of%20Fruits%20Collected)

15. [House Robber](House%20Robber)

16. [House Robber II](House%20Robber%20II)

17. [house-robber](house-robber)

18. [house-robber-iii](house-robber-iii)

19. [Longest Common Subsequence](Longest%20Common%20Subsequence)

20. [Longest Increasing Subsequence](Longest%20Increasing%20Subsequence)

21. [Minimum Falling Path Sum](Minimum%20Falling%20Path%20Sum)

22. [Minimum Path Sum](Minimum%20Path%20Sum)

23. [minimum-distance-to-type-a-word-using-two-fingers](minimum-distance-to-type-a-word-using-two-fingers)

24. [number-of-zigzag-arrays-i](number-of-zigzag-arrays-i)

25. [number-of-zigzag-arrays-ii](number-of-zigzag-arrays-ii)

26. [Partition Equal Subset Sum](Partition%20Equal%20Subset%20Sum)

27. [Pascal's Triangle](Pascal%27s%20Triangle)

28. [pascals-triangle-ii](pascals-triangle-ii)

29. [rotate-function](rotate-function)

30. [Soup Servings](Soup%20Servings)

31. [Triangle](Triangle)

32. [Unique Paths](Unique%20Paths)

33. [Unique Paths II](Unique%20Paths%20II)

34. [Ways to Express an Integer as Sum of Powers](Ways%20to%20Express%20an%20Integer%20as%20Sum%20of%20Powers)

## Graphs

1. [check-if-there-is-a-valid-path-in-a-grid](check-if-there-is-a-valid-path-in-a-grid)

2. [Course Schedule](Course%20Schedule)

3. [Course Schedule II](Course%20Schedule%20II)

4. [Find the City With the Smallest Number of Neighbors at a Threshold Distance](Find%20the%20City%20With%20the%20Smallest%20Number%20of%20Neighbors%20at%20a%20Threshold%20Distance)

5. [keys-and-rooms](keys-and-rooms)

6. [minimize-hamming-distance-after-swap-operations](minimize-hamming-distance-after-swap-operations)

7. [number-of-provinces](number-of-provinces)

8. [Regions Cut By Slashes](Regions%20Cut%20By%20Slashes)

## Trees

1. [Binary Tree Inorder Traversal](Binary%20Tree%20Inorder%20Traversal)

2. [Binary Tree Node to Another](Binary%20Tree%20Node%20to%20Another)

3. [binary-tree-paths](binary-tree-paths)

4. [binary-tree-postorder-traversal](binary-tree-postorder-traversal)

5. [binary-tree-preorder-traversal](binary-tree-preorder-traversal)

6. [binary-tree-right-side-view](binary-tree-right-side-view)

7. [convert-sorted-array-to-binary-search-tree](convert-sorted-array-to-binary-search-tree)

8. [Count Complete Tree Nodes](Count%20Complete%20Tree%20Nodes)

9. [count-good-nodes-in-binary-tree](count-good-nodes-in-binary-tree)

10. [Create Binary Tree](Create%20Binary%20Tree)

11. [Delete Nodes And Return Forest](Delete%20Nodes%20And%20Return%20Forest)

12. [diameter-of-binary-tree](diameter-of-binary-tree)

13. [find-mode-in-binary-search-tree](find-mode-in-binary-search-tree)

14. [Implement Trie (Prefix Tree)](Implement%20Trie%20%28Prefix%20Tree%29)

15. [leaf-similar-trees](leaf-similar-trees)

16. [Longest Substring Without Repeating Characters](Longest%20Substring%20Without%20Repeating%20Characters)

17. [longest-substring-without-repeating-characters](longest-substring-without-repeating-characters)

18. [maximum-depth-of-binary-tree](maximum-depth-of-binary-tree)

19. [maximum-level-sum-of-a-binary-tree](maximum-level-sum-of-a-binary-tree)

20. [maximum-number-of-vowels-in-a-substring-of-given-length](maximum-number-of-vowels-in-a-substring-of-given-length)

21. [Minimum String Length After Removing Substrings](Minimum%20String%20Length%20After%20Removing%20Substrings)

22. [minimum-absolute-difference-in-bst](minimum-absolute-difference-in-bst)

23. [minimum-depth-of-binary-tree](minimum-depth-of-binary-tree)

24. [Number of Good Leaf Nodes Pairs](Number%20of%20Good%20Leaf%20Nodes%20Pairs)

25. [number-of-substrings-containing-all-three-characters](number-of-substrings-containing-all-three-characters)

26. [path-sum](path-sum)

27. [path-sum-ii](path-sum-ii)

28. [Reversed Substring Paranthesis](Reversed%20Substring%20Paranthesis)

29. [same-tree](same-tree)

30. [Search in a Binary Search Tree](Search%20in%20a%20Binary%20Search%20Tree)

31. [sum-of-left-leaves](sum-of-left-leaves)

32. [symmetric-tree](symmetric-tree)

## Matrix & Grid

1. [Build a Matrix With Conditions](Build%20a%20Matrix%20With%20Conditions)

2. [check-if-there-is-a-valid-path-in-a-grid](check-if-there-is-a-valid-path-in-a-grid)

3. [Find Valid Matrix Given Row and Column Sums](Find%20Valid%20Matrix%20Given%20Row%20and%20Column%20Sums)

4. [island-perimeter](island-perimeter)

5. [Length of Longest V-Shaped Diagonal Segment](Length%20of%20Longest%20V-Shaped%20Diagonal%20Segment)

6. [Lucky Numbers in a Matrix](Lucky%20Numbers%20in%20a%20Matrix)

7. [Magic Squares In Grid](Magic%20Squares%20In%20Grid)

8. [Maximum Area of Longest Diagonal Rectangle](Maximum%20Area%20of%20Longest%20Diagonal%20Rectangle)

9. [Minimum Falling Path Sum](Minimum%20Falling%20Path%20Sum)

10. [Minimum Number of Days to Disconnect Island](Minimum%20Number%20of%20Days%20to%20Disconnect%20Island)

11. [Minimum Path Sum](Minimum%20Path%20Sum)

12. [minimum-operations-to-make-a-uni-value-grid](minimum-operations-to-make-a-uni-value-grid)

13. [number-of-islands](number-of-islands)

14. [Regions Cut By Slashes](Regions%20Cut%20By%20Slashes)

15. [Rotate Image](Rotate%20Image)

16. [rotting-oranges](rotting-oranges)

17. [Sort Matrix by Diagonals](Sort%20Matrix%20by%20Diagonals)

18. [Spiral Matrix III](Spiral%20Matrix%20III)

19. [Unique Paths](Unique%20Paths)

20. [Unique Paths II](Unique%20Paths%20II)

21. [Valid Sudoku](Valid%20Sudoku)

22. [word-search](word-search)

## Strings

1. [1935. Maximum Number of Words You Can Type](1935.%20Maximum%20Number%20of%20Words%20You%20Can%20Type)

2. [Add Binary](Add%20Binary)

3. [Break a Palindrome](Break%20a%20Palindrome)

4. [Clear Digits](Clear%20Digits)

5. [Decode String](Decode%20String)

6. [GCD Strings](GCD_Strings)

7. [Implement Trie (Prefix Tree)](Implement%20Trie%20%28Prefix%20Tree%29)

8. [Integer to English Words](Integer%20to%20English%20Words)

9. [Integer to Roman](Integer%20to%20Roman)

10. [is-subsequence](is-subsequence)

11. [Isomorphic Strings](Isomorphic%20Strings)

12. [Largest 3-Same-Digit Number in String](Largest%203-Same-Digit%20Number%20in%20String)

13. [Letter Combinations of a Phone Number](Letter%20Combinations%20of%20a%20Phone%20Number)

14. [letter-combinations-of-a-phone-number](letter-combinations-of-a-phone-number)

15. [Longest Substring Without Repeating Characters](Longest%20Substring%20Without%20Repeating%20Characters)

16. [longest-substring-without-repeating-characters](longest-substring-without-repeating-characters)

17. [Make The String Great](Make%20The%20String%20Great)

18. [Maximum Score](Maximum%20Score)

19. [maximum-number-of-balloons](maximum-number-of-balloons)

20. [maximum-number-of-vowels-in-a-substring-of-given-length](maximum-number-of-vowels-in-a-substring-of-given-length)

21. [Minimum Deletions to Make String Balanced](Minimum%20Deletions%20to%20Make%20String%20Balanced)

22. [Minimum String Length After Removing Substrings](Minimum%20String%20Length%20After%20Removing%20Substrings)

23. [minimum-distance-to-type-a-word-using-two-fingers](minimum-distance-to-type-a-word-using-two-fingers)

24. [Multiply Strings](Multiply%20Strings)

25. [Number Of Atoms](Number%20Of%20Atoms)

26. [Number of Senior Citizens](Number%20of%20Senior%20Citizens)

27. [number-of-substrings-containing-all-three-characters](number-of-substrings-containing-all-three-characters)

28. [Palindrome Partitioning](Palindrome%20Partitioning)

29. [process-string-with-special-operations-i](process-string-with-special-operations-i)

30. [process-string-with-special-operations-ii](process-string-with-special-operations-ii)

31. [Reverse Words in a String](Reverse%20Words%20in%20a%20String)

32. [reverse-vowels-of-a-string](reverse-vowels-of-a-string)

33. [reverse-words-in-a-string](reverse-words-in-a-string)

34. [Reversed Substring Paranthesis](Reversed%20Substring%20Paranthesis)

35. [Sort Vowels in a String](Sort%20Vowels%20in%20a%20String)

36. [String to Integer (atoi)](String%20to%20Integer%20%28atoi%29)

37. [subtract-the-product-and-sum-of-digits-of-an-integer](subtract-the-product-and-sum-of-digits-of-an-integer)

38. [Valid Parentheses](Valid%20Parentheses)

39. [Valid Parenthesis String](Valid%20Parenthesis%20String)

40. [weighted-word-mapping](weighted-word-mapping)

41. [word-search](word-search)

42. [words-within-two-edits-of-dictionary](words-within-two-edits-of-dictionary)

43. [zigzag-conversion](zigzag-conversion)

## Arrays

1. [Assign Cookies](Assign%20Cookies)

2. [Bag of Tokens](Bag%20of%20Tokens)

3. [binary-subarrays-with-sum](binary-subarrays-with-sum)

4. [Boats to Save People](Boats%20to%20Save%20People)

5. [closest-equal-element-queries](closest-equal-element-queries)

6. [concatenation-of-array](concatenation-of-array)

7. [convert-sorted-array-to-binary-search-tree](convert-sorted-array-to-binary-search-tree)

8. [Count Hills and Valleys in an Array](Count%20Hills%20and%20Valleys%20in%20an%20Array)

9. [Count Number of Maximum Bitwise-OR Subsets](Count%20Number%20of%20Maximum%20Bitwise-OR%20Subsets)

10. [Count Number of Teams](Count%20Number%20of%20Teams)

11. [count-number-of-nice-subarrays](count-number-of-nice-subarrays)

12. [count-subarrays-with-majority-element-i](count-subarrays-with-majority-element-i)

13. [Final Prices With a Special Discount in a Shop](Final%20Prices%20With%20a%20Special%20Discount%20in%20a%20Shop)

14. [Find the Maximum Number of Fruits Collected](Find%20the%20Maximum%20Number%20of%20Fruits%20Collected)

15. [Find Valid Matrix Given Row and Column Sums](Find%20Valid%20Matrix%20Given%20Row%20and%20Column%20Sums)

16. [find-the-highest-altitude](find-the-highest-altitude)

17. [Fruit Into Baskets](Fruit%20Into%20Baskets)

18. [fruit-into-baskets](fruit-into-baskets)

19. [Fruits Into Baskets II](Fruits%20Into%20Baskets%20II)

20. [increasing-triplet-subsequence](increasing-triplet-subsequence)

21. [Intersection Two Arrays](Intersection_Two_Arrays)

22. [is-subsequence](is-subsequence)

23. [kids-with-the-greatest-number-of-candies](kids-with-the-greatest-number-of-candies)

24. [Kth Largest Element in a Stream](Kth%20Largest%20Element%20in%20a%20Stream)

25. [Kth Largest Element in an Array](Kth%20Largest%20Element%20in%20an%20Array)

26. [kth-largest-element-in-an-array](kth-largest-element-in-an-array)

27. [Longest Common Subsequence](Longest%20Common%20Subsequence)

28. [Longest Increasing Subsequence](Longest%20Increasing%20Subsequence)

29. [longest-subarray-of-1s-after-deleting-one-element](longest-subarray-of-1s-after-deleting-one-element)

30. [Lucky Numbers in a Matrix](Lucky%20Numbers%20in%20a%20Matrix)

31. [maximize-the-distance-between-points-on-a-square](maximize-the-distance-between-points-on-a-square)

32. [Maximum Area of Longest Diagonal Rectangle](Maximum%20Area%20of%20Longest%20Diagonal%20Rectangle)

33. [Maximum Element After Decreasing and Rearranging](Maximum%20Element%20After%20Decreasing%20and%20Rearranging)

34. [Maximum Ice Cream Bars](Maximum%20Ice%20Cream%20Bars)

35. [Maximum Points You Can Obtain from Cards](Maximum%20Points%20You%20Can%20Obtain%20from%20Cards)

36. [Maximum Subarray](Maximum%20Subarray)

37. [maximum-average-subarray-i](maximum-average-subarray-i)

38. [maximum-ice-cream-bars](maximum-ice-cream-bars)

39. [maximum-subsequence-score](maximum-subsequence-score)

40. [maximum-sum-of-distinct-subarrays-with-length-k](maximum-sum-of-distinct-subarrays-with-length-k)

41. [Median Of Two Sorted Arrays](Median%20Of%20Two%20Sorted%20Arrays)

42. [Merge Intervals](Merge%20Intervals)

43. [Minimum Difference](Minimum_Difference)

44. [Minimum Number of Operations to Make Array Empty](Minimum%20Number%20of%20Operations%20to%20Make%20Array%20Empty)

45. [Minimum Swaps to Group All 1's Together II](Minimum%20Swaps%20to%20Group%20All%201%27s%20Together%20II)

46. [minimum-distance-between-three-equal-elements-ii](minimum-distance-between-three-equal-elements-ii)

47. [minimum-size-subarray-sum](minimum-size-subarray-sum)

48. [move-zeroes](move-zeroes)

49. [Next Permutation](Next%20Permutation)

50. [number-of-sub-arrays-of-size-k-and-average-greater-than-or-equal-to-threshold](number-of-sub-arrays-of-size-k-and-average-greater-than-or-equal-to-threshold)

51. [number-of-zigzag-arrays-i](number-of-zigzag-arrays-i)

52. [number-of-zigzag-arrays-ii](number-of-zigzag-arrays-ii)

53. [Partition Equal Subset Sum](Partition%20Equal%20Subset%20Sum)

54. [Pascal's Triangle](Pascal%27s%20Triangle)

55. [pascals-triangle-ii](pascals-triangle-ii)

56. [permutations](permutations)

57. [permutations-ii](permutations-ii)

58. [Range Product Queries of Powers](Range%20Product%20Queries%20of%20Powers)

59. [Rearranging Fruits](Rearranging%20Fruits)

60. [Remove Element](Remove%20Element)

61. [Replace Elements with Greatest Element on Right Side](Replace%20Elements%20with%20Greatest%20Element%20on%20Right%20Side)

62. [running-sum-of-1d-array](running-sum-of-1d-array)

63. [shortest-subarray-to-be-removed-to-make-array-sorted](shortest-subarray-to-be-removed-to-make-array-sorted)

64. [Sort an Array](Sort%20an%20Array)

65. [Sort Array by Increasing Frequency](Sort%20Array%20by%20Increasing%20Frequency)

66. [Sort the People](Sort%20the%20People)

67. [subsets](subsets)

68. [Subsets II](Subsets%20II)

69. [subsets-ii](subsets-ii)

70. [Sum of Subarray Minimums](Sum%20of%20Subarray%20Minimums)

71. [sum-of-all-subset-xor-totals](sum-of-all-subset-xor-totals)

72. [sum-of-distances](sum-of-distances)

73. [total-cost-to-hire-k-workers](total-cost-to-hire-k-workers)

74. [Two Sum](Two%20Sum)

75. [Valid Sudoku](Valid%20Sudoku)

76. [xor-after-range-multiplication-queries-i](xor-after-range-multiplication-queries-i)

## Linked List

1. [Delete Node in a Linked List](Delete%20Node%20in%20a%20Linked%20List)

2. [Delete the Middle Node of a Linked List](Delete%20the%20Middle%20Node%20of%20a%20Linked%20List)

3. [delete-the-middle-node-of-a-linked-list](delete-the-middle-node-of-a-linked-list)

4. [Intersection of Two Linked Lists](Intersection%20of%20Two%20Linked%20Lists)

5. [Linked List Cycle](Linked%20List%20Cycle)

6. [maximum-twin-sum-of-a-linked-list](maximum-twin-sum-of-a-linked-list)

7. [Merge Two Sorted Lists](Merge%20Two%20Sorted%20Lists)

8. [Merged Notes Between Zeros](Merged_Notes_Between_Zeros)

9. [Middle of the Linked List](Middle%20of%20the%20Linked%20List)

10. [Min Max No Nodes](Min_Max_No_Nodes)

11. [Odd Even Linked List](Odd%20Even%20Linked%20List)

12. [Remove Nodes From Linked List](Remove%20Nodes%20From%20Linked%20List)

13. [reorder-list](reorder-list)

14. [REVERSE LINKED LIST](REVERSE%20LINKED%20LIST)

15. [Sort List](Sort%20List)

## Stack

1. [Asteroid Collision](Asteroid%20Collision)

2. [Clear Digits](Clear%20Digits)

3. [Daily Temperatures](Daily%20Temperatures)

4. [daily-temperatures](daily-temperatures)

5. [Decode String](Decode%20String)

6. [Final Prices With a Special Discount in a Shop](Final%20Prices%20With%20a%20Special%20Discount%20in%20a%20Shop)

7. [generate-parentheses](generate-parentheses)

8. [Make The String Great](Make%20The%20String%20Great)

9. [Minimum String Length After Removing Substrings](Minimum%20String%20Length%20After%20Removing%20Substrings)

10. [Robot Collisions](Robot%20Collisions)

11. [Sum of Subarray Minimums](Sum%20of%20Subarray%20Minimums)

12. [Valid Parentheses](Valid%20Parentheses)

13. [Valid Parenthesis String](Valid%20Parenthesis%20String)

## Queue

1. [Kth Largest Element in a Stream](Kth%20Largest%20Element%20in%20a%20Stream)

2. [rotting-oranges](rotting-oranges)

## Heap / Priority Queue

1. [Kth Largest Element in a Stream](Kth%20Largest%20Element%20in%20a%20Stream)

2. [Kth Largest Element in an Array](Kth%20Largest%20Element%20in%20an%20Array)

3. [kth-largest-element-in-an-array](kth-largest-element-in-an-array)

4. [total-cost-to-hire-k-workers](total-cost-to-hire-k-workers)

## Sliding Window

1. [binary-subarrays-with-sum](binary-subarrays-with-sum)

2. [count-number-of-nice-subarrays](count-number-of-nice-subarrays)

3. [count-subarrays-with-majority-element-i](count-subarrays-with-majority-element-i)

4. [Fruit Into Baskets](Fruit%20Into%20Baskets)

5. [fruit-into-baskets](fruit-into-baskets)

6. [Longest Repeating Character Replacement](Longest%20Repeating%20Character%20Replacement)

7. [Longest Substring Without Repeating Characters](Longest%20Substring%20Without%20Repeating%20Characters)

8. [longest-repeating-character-replacement](longest-repeating-character-replacement)

9. [longest-subarray-of-1s-after-deleting-one-element](longest-subarray-of-1s-after-deleting-one-element)

10. [longest-substring-without-repeating-characters](longest-substring-without-repeating-characters)

11. [Max Consecutive Ones III](Max%20Consecutive%20Ones%20III)

12. [max-consecutive-ones-iii](max-consecutive-ones-iii)

13. [Maximum Points You Can Obtain from Cards](Maximum%20Points%20You%20Can%20Obtain%20from%20Cards)

14. [Maximum Subarray](Maximum%20Subarray)

15. [maximum-average-subarray-i](maximum-average-subarray-i)

16. [maximum-number-of-vowels-in-a-substring-of-given-length](maximum-number-of-vowels-in-a-substring-of-given-length)

17. [maximum-sum-of-distinct-subarrays-with-length-k](maximum-sum-of-distinct-subarrays-with-length-k)

18. [minimum-size-subarray-sum](minimum-size-subarray-sum)

19. [number-of-substrings-containing-all-three-characters](number-of-substrings-containing-all-three-characters)

20. [shortest-subarray-to-be-removed-to-make-array-sorted](shortest-subarray-to-be-removed-to-make-array-sorted)

21. [Sliding Window Maximum](Sliding%20Window%20Maximum)

22. [Sum of Subarray Minimums](Sum%20of%20Subarray%20Minimums)

## Two Pointers

1. [Boats to Save People](Boats%20to%20Save%20People)

2. [is-subsequence](is-subsequence)

3. [Linked List Cycle](Linked%20List%20Cycle)

4. [Median Of Two Sorted Arrays](Median%20Of%20Two%20Sorted%20Arrays)

5. [Merge Intervals](Merge%20Intervals)

6. [Merge Two Sorted Lists](Merge%20Two%20Sorted%20Lists)

7. [Middle of the Linked List](Middle%20of%20the%20Linked%20List)

8. [Minimum Swaps to Group All 1's Together II](Minimum%20Swaps%20to%20Group%20All%201%27s%20Together%20II)

9. [move-zeroes](move-zeroes)

10. [reverse-vowels-of-a-string](reverse-vowels-of-a-string)

11. [Sort Vowels in a String](Sort%20Vowels%20in%20a%20String)

12. [Two Sum](Two%20Sum)

## Binary Search

1. [binary-search](binary-search)

2. [convert-sorted-array-to-binary-search-tree](convert-sorted-array-to-binary-search-tree)

3. [find-mode-in-binary-search-tree](find-mode-in-binary-search-tree)

4. [Kth Largest Element in an Array](Kth%20Largest%20Element%20in%20an%20Array)

5. [kth-largest-element-in-an-array](kth-largest-element-in-an-array)

6. [maximize-the-distance-between-points-on-a-square](maximize-the-distance-between-points-on-a-square)

7. [Median Of Two Sorted Arrays](Median%20Of%20Two%20Sorted%20Arrays)

8. [minimum-size-subarray-sum](minimum-size-subarray-sum)

9. [Search in a Binary Search Tree](Search%20in%20a%20Binary%20Search%20Tree)

## Backtracking

1. [Combination Sum](Combination%20Sum)

2. [combination-sum](combination-sum)

3. [combination-sum-ii](combination-sum-ii)

4. [combination-sum-iii](combination-sum-iii)

5. [combinations](combinations)

6. [Count Number of Maximum Bitwise-OR Subsets](Count%20Number%20of%20Maximum%20Bitwise-OR%20Subsets)

7. [generate-parentheses](generate-parentheses)

8. [Letter Combinations of a Phone Number](Letter%20Combinations%20of%20a%20Phone%20Number)

9. [letter-combinations-of-a-phone-number](letter-combinations-of-a-phone-number)

10. [N-Queens](N-Queens)

11. [n-queens-ii](n-queens-ii)

12. [Next Permutation](Next%20Permutation)

13. [Palindrome Partitioning](Palindrome%20Partitioning)

14. [permutations](permutations)

15. [permutations-ii](permutations-ii)

16. [subsets](subsets)

17. [Subsets II](Subsets%20II)

18. [subsets-ii](subsets-ii)

19. [word-search](word-search)

## Greedy

1. [Assign Cookies](Assign%20Cookies)

2. [Bag of Tokens](Bag%20of%20Tokens)

3. [Best Time to Buy and Sell Stock](Best%20Time%20to%20Buy%20and%20Sell%20Stock)

4. [Boats to Save People](Boats%20to%20Save%20People)

5. [Broken Calculator](Broken%20Calculator)

6. [can-place-flowers](can-place-flowers)

7. [jump-game](jump-game)

8. [Maximum Element After Decreasing and Rearranging](Maximum%20Element%20After%20Decreasing%20and%20Rearranging)

9. [Maximum Ice Cream Bars](Maximum%20Ice%20Cream%20Bars)

10. [Maximum Score](Maximum%20Score)

11. [maximum-ice-cream-bars](maximum-ice-cream-bars)

12. [maximum-subsequence-score](maximum-subsequence-score)

13. [Minimum Number of Operations to Make Array Empty](Minimum%20Number%20of%20Operations%20to%20Make%20Array%20Empty)

14. [Rearranging Fruits](Rearranging%20Fruits)

15. [Remove Colored Pieces if Both Neighbors are the Same Color](Remove%20Colored%20Pieces%20if%20Both%20Neighbors%20are%20the%20Same%20Color)

16. [Valid Parenthesis String](Valid%20Parenthesis%20String)

## Sorting

1. [convert-sorted-array-to-binary-search-tree](convert-sorted-array-to-binary-search-tree)

2. [Kth Largest Element in a Stream](Kth%20Largest%20Element%20in%20a%20Stream)

3. [Kth Largest Element in an Array](Kth%20Largest%20Element%20in%20an%20Array)

4. [kth-largest-element-in-an-array](kth-largest-element-in-an-array)

5. [Maximum Element After Decreasing and Rearranging](Maximum%20Element%20After%20Decreasing%20and%20Rearranging)

6. [Maximum Ice Cream Bars](Maximum%20Ice%20Cream%20Bars)

7. [maximum-ice-cream-bars](maximum-ice-cream-bars)

8. [Median Of Two Sorted Arrays](Median%20Of%20Two%20Sorted%20Arrays)

9. [Merge Intervals](Merge%20Intervals)

10. [Merge Two Sorted Lists](Merge%20Two%20Sorted%20Lists)

11. [Minimum Difference](Minimum_Difference)

12. [Rearranging Fruits](Rearranging%20Fruits)

13. [shortest-subarray-to-be-removed-to-make-array-sorted](shortest-subarray-to-be-removed-to-make-array-sorted)

14. [Sort an Array](Sort%20an%20Array)

15. [Sort Array by Increasing Frequency](Sort%20Array%20by%20Increasing%20Frequency)

16. [Sort List](Sort%20List)

17. [Sort Matrix by Diagonals](Sort%20Matrix%20by%20Diagonals)

18. [Sort the People](Sort%20the%20People)

19. [Sort Vowels in a String](Sort%20Vowels%20in%20a%20String)

## Hash Table

1. [closest-equal-element-queries](closest-equal-element-queries)

2. [count-subarrays-with-majority-element-i](count-subarrays-with-majority-element-i)

3. [find-mode-in-binary-search-tree](find-mode-in-binary-search-tree)

4. [Intersection of Two Linked Lists](Intersection%20of%20Two%20Linked%20Lists)

5. [Intersection Two Arrays](Intersection_Two_Arrays)

6. [Isomorphic Strings](Isomorphic%20Strings)

7. [maximum-number-of-balloons](maximum-number-of-balloons)

8. [minimize-hamming-distance-after-swap-operations](minimize-hamming-distance-after-swap-operations)

9. [minimum-distance-between-three-equal-elements-ii](minimum-distance-between-three-equal-elements-ii)

10. [Number Of Atoms](Number%20Of%20Atoms)

11. [number-of-substrings-containing-all-three-characters](number-of-substrings-containing-all-three-characters)

12. [repeated-dna-sequences](repeated-dna-sequences)

13. [Two Sum](Two%20Sum)

14. [Valid Sudoku](Valid%20Sudoku)

15. [weighted-word-mapping](weighted-word-mapping)

16. [words-within-two-edits-of-dictionary](words-within-two-edits-of-dictionary)

## Prefix Sum

1. [binary-subarrays-with-sum](binary-subarrays-with-sum)

2. [count-number-of-nice-subarrays](count-number-of-nice-subarrays)

3. [count-subarrays-with-majority-element-i](count-subarrays-with-majority-element-i)

4. [Find the City With the Smallest Number of Neighbors at a Threshold Distance](Find%20the%20City%20With%20the%20Smallest%20Number%20of%20Neighbors%20at%20a%20Threshold%20Distance)

5. [find-the-highest-altitude](find-the-highest-altitude)

6. [longest-subarray-of-1s-after-deleting-one-element](longest-subarray-of-1s-after-deleting-one-element)

7. [Maximum Points You Can Obtain from Cards](Maximum%20Points%20You%20Can%20Obtain%20from%20Cards)

8. [Maximum Subarray](Maximum%20Subarray)

9. [maximum-average-subarray-i](maximum-average-subarray-i)

10. [maximum-sum-of-distinct-subarrays-with-length-k](maximum-sum-of-distinct-subarrays-with-length-k)

11. [minimum-size-subarray-sum](minimum-size-subarray-sum)

12. [number-of-sub-arrays-of-size-k-and-average-greater-than-or-equal-to-threshold](number-of-sub-arrays-of-size-k-and-average-greater-than-or-equal-to-threshold)

13. [Range Product Queries of Powers](Range%20Product%20Queries%20of%20Powers)

14. [running-sum-of-1d-array](running-sum-of-1d-array)

15. [shortest-subarray-to-be-removed-to-make-array-sorted](shortest-subarray-to-be-removed-to-make-array-sorted)

16. [Sum of Subarray Minimums](Sum%20of%20Subarray%20Minimums)

17. [xor-after-range-multiplication-queries-i](xor-after-range-multiplication-queries-i)

## Bit Manipulation

1. [Count Number of Maximum Bitwise-OR Subsets](Count%20Number%20of%20Maximum%20Bitwise-OR%20Subsets)

2. [counting-bits](counting-bits)

3. [Power of Four](Power%20of%20Four)

4. [Power of Three](Power%20of%20Three)

5. [Power of Two](Power%20of%20Two)

6. [Reordered Power of 2](Reordered%20Power%20of%202)

7. [Single Number](Single%20Number)

8. [Single Number II](Single%20Number%20II)

9. [single-number](single-number)

10. [sum-of-all-subset-xor-totals](sum-of-all-subset-xor-totals)

11. [xor-after-range-multiplication-queries-i](xor-after-range-multiplication-queries-i)

## Math

1. [Alice and Bob Playing Flower Game](Alice%20and%20Bob%20Playing%20Flower%20Game)

2. [angle-between-hands-of-a-clock](angle-between-hands-of-a-clock)

3. [Broken Calculator](Broken%20Calculator)

4. [Count Number of Maximum Bitwise-OR Subsets](Count%20Number%20of%20Maximum%20Bitwise-OR%20Subsets)

5. [Count Number of Teams](Count%20Number%20of%20Teams)

6. [count-number-of-nice-subarrays](count-number-of-nice-subarrays)

7. [DYNAMIC PROGRAMMING / Fibonacci Number](DYNAMIC%20PROGRAMMING/Fibonacci%20Number)

8. [DYNAMIC PROGRAMMING / N-th Tribonacci Number](DYNAMIC%20PROGRAMMING/N-th%20Tribonacci%20Number)

9. [Fibonacci Number](Fibonacci%20Number)

10. [fibonacci-number](fibonacci-number)

11. [Find Closest Person](Find%20Closest%20Person)

12. [fizz-buzz](fizz-buzz)

13. [Integer to English Words](Integer%20to%20English%20Words)

14. [Integer to Roman](Integer%20to%20Roman)

15. [Maximum Area of Longest Diagonal Rectangle](Maximum%20Area%20of%20Longest%20Diagonal%20Rectangle)

16. [Number of Senior Citizens](Number%20of%20Senior%20Citizens)

17. [Pascal's Triangle](Pascal%27s%20Triangle)

18. [pascals-triangle-ii](pascals-triangle-ii)

19. [Pass The Pillow](Pass%20The%20Pillow)

20. [Power of Four](Power%20of%20Four)

21. [Power of Three](Power%20of%20Three)

22. [Power of Two](Power%20of%20Two)

23. [Range Product Queries of Powers](Range%20Product%20Queries%20of%20Powers)

24. [Reordered Power of 2](Reordered%20Power%20of%202)

25. [rotate-function](rotate-function)

26. [Soup Servings](Soup%20Servings)

27. [String to Integer (atoi)](String%20to%20Integer%20%28atoi%29)

28. [subtract-the-product-and-sum-of-digits-of-an-integer](subtract-the-product-and-sum-of-digits-of-an-integer)

29. [total-waviness-of-numbers-in-range-i](total-waviness-of-numbers-in-range-i)

30. [Triangle](Triangle)

31. [Water Bottles](Water_Bottles)

32. [Ways to Express an Integer as Sum of Powers](Ways%20to%20Express%20an%20Integer%20as%20Sum%20of%20Powers)

33. [zigzag-conversion](zigzag-conversion)

## Simulation

1. [Alice and Bob Playing Flower Game](Alice%20and%20Bob%20Playing%20Flower%20Game)

2. [Asteroid Collision](Asteroid%20Collision)

3. [Average Waiting Time](Average%20Waiting%20Time)

4. [Circular Game](Circular_Game)

5. [Crawler Log Folder](Crawler%20Log%20Folder)

6. [divisor-game](divisor-game)

7. [earliest-finish-time-for-land-and-water-rides-i](earliest-finish-time-for-land-and-water-rides-i)

8. [earliest-finish-time-for-land-and-water-rides-ii](earliest-finish-time-for-land-and-water-rides-ii)

9. [Final Prices With a Special Discount in a Shop](Final%20Prices%20With%20a%20Special%20Discount%20in%20a%20Shop)

10. [Find Closest Person](Find%20Closest%20Person)

11. [fizz-buzz](fizz-buzz)

12. [jump-game](jump-game)

13. [Pass The Pillow](Pass%20The%20Pillow)

14. [process-string-with-special-operations-i](process-string-with-special-operations-i)

15. [process-string-with-special-operations-ii](process-string-with-special-operations-ii)

16. [Robot Collisions](Robot%20Collisions)

17. [Rotate Image](Rotate%20Image)

18. [Spiral Matrix III](Spiral%20Matrix%20III)

19. [Walking Robot Simulation](Walking%20Robot%20Simulation)

## Database / SQL

1. [Combine Two Tables](Combine_Two_Tables)