Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1261 | Letter Combinations of a Phone Number | Medium | Hash TableStringBacktracking |
| 1262 | Lexicographically Minimum String After Removing Stars | Medium | Hash TableStringStack |
| 1263 | Lexicographically Smallest Equivalent String | Medium | StringUnion Find |
| 1264 | Lexicographically Smallest Generated String | Hard | StringGreedyString Matching |
| 1265 | Lexicographically Smallest Palindrome | Easy | Two PointersStringGreedy |
| 1266 | Lexicographically Smallest String After a Swap | Easy | StringGreedy |
| 1267 | Lexicographically Smallest String After Adjacent Removals | Hard | StringDynamic Programming |
| 1268 | Lexicographically Smallest String After Operations With Constraint | Medium | StringGreedy |
| 1269 | Lexicographically Smallest String After Substring Operation | Medium | StringGreedy |
| 1270 | Linked List Components | Medium | ArrayHash TableLinked List |
| 1271 | Linked List Cycle | Easy | Hash TableLinked ListTwo Pointers |
| 1272 | Linked List Cycle II | Medium | Hash TableLinked ListTwo Pointers |
| 1273 | Linked List Frequency | Unknown | Hash TableLinked ListCounting |
| 1274 | Linked List in Binary Tree | Medium | Linked ListTreeDepth-First Search |
| 1275 | Linked List Random Node | Medium | Linked ListMathReservoir Sampling |
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