Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 721 | Strobogrammatic Number | Medium | Hash TableTwo PointersString |
| 722 | Strobogrammatic Number II | Medium | ArrayStringRecursion |
| 723 | Strobogrammatic Number III | Hard | ArrayStringRecursion |
| 724 | Strong Password Checker | Hard | StringGreedyHeap (Priority Queue) |
| 725 | Strong Password Checker II | Easy | String |
| 726 | Student Attendance Record I | Easy | String |
| 727 | Subdomain Visit Count | Medium | ArrayHash TableString |
| 728 | Subsequence With the Minimum Score | Hard | Two PointersStringBinary Search |
| 729 | Substring Matching Pattern | Easy | StringString Matching |
| 730 | Substring with Concatenation of All Words | Hard | Hash TableStringSliding Window |
| 731 | Substring XOR Queries | Medium | ArrayHash TableString |
| 732 | Substrings of Size Three with Distinct Characters | Easy | Hash TableStringSliding Window |
| 733 | Substrings That Begin and End With the Same Letter | Medium | Hash TableMathString |
| 734 | Sum Game | Medium | MathStringGreedy |
| 735 | Sum of Beauty of All Substrings | Medium | Hash TableStringCounting |
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