Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 2131 | Number of Unique Subjects Taught by Each Teacher | Easy | Database |
| 2132 | Number of Unique XOR Triplets I | Medium | ArrayMathBit Manipulation |
| 2133 | Number of Unique XOR Triplets II | Medium | ArrayMathBit Manipulation |
| 2134 | Number of Valid Clock Times | Easy | StringEnumeration |
| 2135 | Number of Valid Subarrays | Hard | ArrayStackMonotonic Stack |
| 2136 | Number of Valid Words for Each Puzzle | Hard | ArrayHash TableString |
| 2137 | Number of Valid Words in a Sentence | Easy | String |
| 2138 | Number of Ways of Cutting a Pizza | Hard | ArrayDynamic ProgrammingMemoization |
| 2139 | Number of Ways to Arrive at Destination | Medium | Dynamic ProgrammingGraphTopological Sort |
| 2140 | Number of Ways to Assign Edge Weights I | Medium | MathTreeDepth-First Search |
| 2141 | Number of Ways to Assign Edge Weights II | Hard | ArrayMathDynamic Programming |
| 2142 | Number of Ways to Build House of Cards | Medium | MathDynamic Programming |
| 2143 | Number of Ways to Build Sturdy Brick Wall | Medium | ArrayDynamic ProgrammingBit Manipulation |
| 2144 | Number of Ways to Buy Pens and Pencils | Medium | MathEnumeration |
| 2145 | Number of Ways to Divide a Long Corridor | Hard | MathStringDynamic Programming |
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