Practice problems across 75+ categories
Practice coding problems across all companies and topics • 3600 problems | 879 Easy | 1856 Medium | 842 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 0 | Sudoku Solver | Hard | |
| 0 | Unique Paths II | Medium | |
| 1 | Longest Palindromic Substring | Medium | Two PointersStringDynamic Programming |
| 1 | Longest Substring Without Repeating Characters | Medium | Hash TableStringSliding Window |
| 1 | Median of Two Sorted Arrays | Hard | ArrayBinary SearchDivide and Conquer |
| 1 | Two Sum | Easy | ArrayHash Table |
| 2 | Add Two Numbers | Medium | Linked ListMathRecursion |
| 6 | Zigzag Conversion | Medium | String |
| 7 | Reverse Integer | Medium | Math |
| 8 | String to Integer (atoi) | Medium | String |
| 9 | Palindrome Number | Easy | Math |
| 10 | Regular Expression Matching | Hard | StringDynamic ProgrammingRecursion |
| 11 | Container With Most Water | Medium | ArrayTwo PointersGreedy |
| 12 | Integer to Roman | Medium | Hash TableMathString |
| 13 | Roman to Integer | Easy | Hash TableMathString |
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