Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 2341 | Redundant Connection | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 2342 | Reformat Date | Easy | String |
| 2343 | Reformat Department Table | Easy | Database |
| 2344 | Regular Expression Matching | Hard | StringDynamic ProgrammingRecursion |
| 2345 | Relative Ranks | Easy | ArraySortingHeap (Priority Queue) |
| 2346 | Relative Sort Array | Easy | ArrayHash TableSorting |
| 2347 | Relocate Marbles | Medium | ArrayHash TableSorting |
| 2348 | Remove 9 | Hard | Math |
| 2349 | Remove Adjacent Almost-Equal Characters | Medium | StringDynamic ProgrammingGreedy |
| 2350 | Remove All Occurrences of a Substring | Medium | StringStackSimulation |
| 2351 | Remove All Ones With Row and Column Flips | Medium | ArrayMathBit Manipulation |
| 2352 | Remove All Ones With Row and Column Flips II | Medium | ArrayBit ManipulationBreadth-First Search |
| 2353 | Remove Boxes | Hard | ArrayDynamic ProgrammingMemoization |
| 2354 | Remove Colored Pieces if Both Neighbors are the Same Color | Medium | MathStringGreedy |
| 2355 | Remove Digit From Number to Maximize Result | Easy | StringGreedyEnumeration |
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