Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1306 | Longest Palindrome After Substring Concatenation I | Medium | Two PointersStringDynamic Programming |
| 1307 | Longest Palindrome After Substring Concatenation II | Hard | Two PointersStringDynamic Programming |
| 1308 | Longest Palindrome by Concatenating Two Letter Words | Medium | ArrayHash TableString |
| 1309 | Longest Palindromic Subsequence | Medium | StringDynamic Programming |
| 1310 | Longest Palindromic Subsequence After at Most K Operations | Medium | StringDynamic Programming |
| 1311 | Longest Palindromic Subsequence II | Medium | StringDynamic Programming |
| 1312 | Longest Palindromic Substring | Medium | Two PointersStringDynamic Programming |
| 1313 | Longest Path With Different Adjacent Characters | Hard | ArrayStringTree |
| 1314 | Longest Repeating Character Replacement | Medium | Hash TableStringSliding Window |
| 1315 | Longest Repeating Substring | Medium | StringBinary SearchDynamic Programming |
| 1316 | Longest Special Path II | Hard | ArrayHash TableTree |
| 1317 | Longest Square Streak in an Array | Medium | ArrayHash TableBinary Search |
| 1318 | Longest Strictly Increasing or Strictly Decreasing Subarray | Easy | Array |
| 1319 | Longest String Chain | Medium | ArrayHash TableTwo Pointers |
| 1320 | Longest Subarray of 1's After Deleting One Element | Medium | ArrayDynamic ProgrammingSliding Window |
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