| Problem | Explanation | Python | Java | C++ | TypeScript | Difficulty |
|---|---|---|---|---|---|---|
| 121 Best Time to Buy and Sell Stock | ✔️ | ✔️ | ❌ | ✔️ | ✔️ | Easy |
| 128. Longest Consecutive Sequence | ❌ | ✔️ | ❌ | ✔️ | ❌ | Medium |
| 424. Longest Repeating Character Replacement | ❌ | ✔️ | ❌ | ❌ | ❌ | Medium |
| 217. Contains Duplicate | ✔️ | ✔️ | ❌ | ✔️ | ✔️ | Easy |
| 242. Valid Anagram | ✔️ | ✔️ | ❌ | ❌ | ❌ | Easy |
| 1. Two Sum | ✔️ | ✔️ | ❌ | ❌ | ❌ | Easy |