Practice problems across 75+ categories
Practice problems frequently asked at Facebook • 275 problems | 55 Easy | 175 Medium | 42 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 211 | Reformat The String | Easy | String |
| 212 | Regions Cut By Slashes | Medium | ArrayHash TableDepth-First Search |
| 213 | Remove All Adjacent Duplicates In String | Easy | StringStack |
| 214 | Remove All Adjacent Duplicates in String II | Medium | StringStack |
| 215 | Remove Comments | Medium | ArrayString |
| 216 | Remove Covered Intervals | Medium | ArraySorting |
| 217 | Remove Duplicate Letters | Medium | StringStackGreedy |
| 218 | Remove Palindromic Subsequences | Easy | Two PointersString |
| 219 | Reordered Power of 2 | Medium | Hash TableMathSorting |
| 220 | Replace All ?'s to Avoid Consecutive Repeating Characters | Easy | String |
| 221 | Reshape the Matrix | Easy | ArrayMatrixSimulation |
| 222 | Restore The Array | Hard | StringDynamic Programming |
| 223 | Reverse Prefix of Word | Easy | Two PointersStringStack |
| 224 | Reverse Substrings Between Each Pair of Parentheses | Medium | StringStack |
| 225 | Reverse Words in a String | Medium | Two PointersString |
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