https://github.com/ahmedalyelghannam/leetcode_playground

Just a repo to collect my solutions for Leetcode problems.
https://github.com/ahmedalyelghannam/leetcode_playground

cpp leetcode-solutions problem-solving

Last synced: 24 days ago
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Just a repo to collect my solutions for Leetcode problems.

• Host: GitHub
• URL: https://github.com/ahmedalyelghannam/leetcode_playground
• Owner: AhmedAlyElGhannam
• Created: 2025-04-11T02:58:10.000Z (about 2 months ago)
• Default Branch: main
• Last Pushed: 2025-05-10T09:40:40.000Z (28 days ago)
• Last Synced: 2025-05-10T10:32:43.403Z (28 days ago)
• Topics: cpp, leetcode-solutions, problem-solving
• Language: C++
• Homepage:
• Size: 47.9 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# LeetCode_Playground

## Progress

### Day 1 (9/4/2025)

- [x] 4. Median of Two Sorted Arrays **Hard**

- [x] 35. Search Insert Position **Easy**

- [x] 374. Guess Number Higher or Lower **Easy**

- [x] 704. Binary Search **Easy**

### Day 2 (10/4/2025)

- [x] 744. Find Smallest Letter Greater Than Target **Easy**

### Day 3 (11/4/2025)

- [x] 50. pow(x, n) **Medium**

### Day 4 (12/4/2025)

- [x] 2. Add Two Numbers **Medium**

- [x] 231. Power of Two **Easy**

- [x] 191. Number of 1 Bits **Easy**

### Day 5 (13/4/2025)

- [x] 148. Sort List **Easy**

- [x] 190. Reverse Bits **Easy**

- [x] 326. Power of Three **Easy**

- [x] 342. Power of Four **Easy**

### Day 6 (14/4/2025)

- [x] 143. Reorder List **Medium**

- [x] 206. Reverse Linked List **Easy**

- [x] 2807. In Greatest Common Divisor in Linked List **Medium**

- [x] 876. Middle of The Linked List **Easy**

### Day 7 (15/4/2025)

- [x] 21. Merge Two Sorted Lists **Easy**

- [x] 217. Contains Duplicate **Easy**

### Day 8 (16/4/2025)

- [x] 141. Linked List Cycle **Easy**

### Day 9 (17/4/2025)

- [x] 160. Intersection of Two Linked Lists **Easy**

### Day 10 (18/4/2025)

- [x] 169. Majority Element **Easy**

### Day 11 (19/4/2025)

- [x] 169. Majority Element **Easy** (Solved it again with a different approach)

- [x] 229. Majority Element II **Medium**

## Solution Rationale

- #4 Median of Two Sorted Arrays → Inserted two vectors into a larger vector and used `stl` sorting algorithm on it.

- #35 Search Insert Position → Binary search to find if the element is already there **or if it is not, return `lowerBound` since it holds the index at which element should be inserted in**.

- #374 Guess Number Higher or Lower → Binary search with extra steps.

- #704 Binary Search → Binary search.

- #744 Find Smallest Letter Greater Than Target → Binary search but with letters.

- #50 pow(x, n) → Exponentiation by squaring with recursion + wrapper function to handle negative powers.

- #2 Add Two Numbers → Recursion to handle base cases and carry + utilized Linked Lists properties.

- #231 Power of Two &arr; Solved it twice: using recursion & bit masking then using a single bit manipulation statement. Both run blazingly fast but the single statement uses slightly lower memory.

- #191 Number of 1 Bits → Recursion and bit masking. Similar to my recursive approach in #231 but even easier.