Practice problems across 75+ categories
Practice coding problems across all companies and topics • 3600 problems | 879 Easy | 1856 Medium | 842 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 256 | Paint House | Medium | ArrayDynamic Programming |
| 257 | Binary Tree Paths | Easy | StringBacktrackingTree |
| 258 | Add Digits | Easy | MathSimulationNumber Theory |
| 259 | 3Sum Smaller | Medium | ArrayTwo PointersBinary Search |
| 260 | Single Number III | Medium | ArrayBit Manipulation |
| 261 | Graph Valid Tree | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 262 | Paint House II | Hard | ArrayDynamic Programming |
| 262 | Trips and Users | Hard | Database |
| 263 | Ugly Number | Easy | Math |
| 264 | Ugly Number II | Medium | Hash TableMathDynamic Programming |
| 266 | Alien Dictionary | Hard | ArrayStringDepth-First Search |
| 266 | Palindrome Permutation | Easy | Hash TableStringBit Manipulation |
| 267 | Palindrome Permutation II | Medium | Hash TableStringBacktracking |
| 268 | Missing Number | Easy | ArrayHash TableMath |
| 269 | Closest Binary Search Tree Value II | Hard | Two PointersStackTree |
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