Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 2236 | Perfect Squares | Medium | MathDynamic ProgrammingBreadth-First Search |
| 2237 | Perform String Shifts | Easy | ArrayMathString |
| 2238 | Permutation Difference between Two Strings | Easy | Hash TableString |
| 2239 | Permutation Sequence | Hard | MathRecursion |
| 2240 | Permutations | Medium | ArrayBacktracking |
| 2241 | Permutations II | Medium | ArrayBacktrackingSorting |
| 2242 | Permutations III | Medium | ArrayBacktracking |
| 2243 | Phone Number Prefix | Easy | ArrayStringTrie |
| 2244 | Pizza With 3n Slices | Hard | ArrayDynamic ProgrammingGreedy |
| 2245 | Plates Between Candles | Medium | ArrayStringBinary Search |
| 2246 | Points That Intersect With Cars | Easy | ArrayHash TablePrefix Sum |
| 2247 | Poor Pigs | Hard | MathDynamic ProgrammingCombinatorics |
| 2248 | Popularity Percentage | Hard | Database |
| 2249 | Populating Next Right Pointers in Each Node II | Medium | Linked ListTreeDepth-First Search |
| 2250 | Possible Bipartition | Medium | Depth-First SearchBreadth-First SearchUnion Find |
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