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🔥 Easy 🔥🔥 Medium 🔥🔥🔥 Hard
| Challenge | Level | Java | Kotlin |
|---|---|---|---|
| 20. ValidParentheses | 🔥 | Solution | - |
| 26. Remove Duplicates | 🔥 | Solution | - |
| 27. Remove Element | 🔥 | Solution | - |
| 1929. Concatenation Of Array | 🔥 | Solution | - |
| 17. Letter Combinations of a Phone Number | 🔥🔥 | Solution | - |
| 91. Decode Ways | 🔥🔥 | Solution | - |
| 1143. Longest Common Subsequence | 🔥🔥 | Solution | |
| 658. Find K Closest Elements | 🔥🔥 | Solution | - |
| 41. First Missing Positive | 🔥🔥🔥 | Solution | Solution |
