Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 286 | Hexspeak | Easy | MathString |
| 287 | High-Access Employees | Medium | ArrayHash TableString |
| 288 | HTML Entity Parser | Medium | Hash TableString |
| 289 | Implement Magic Dictionary | Medium | Hash TableStringDepth-First Search |
| 290 | Implement Trie II (Prefix Tree) | Unknown | Hash TableStringDesign |
| 291 | Implement Trie (Prefix Tree) | Medium | Hash TableStringDesign |
| 292 | Increasing Decreasing String | Easy | Hash TableStringCounting |
| 293 | Index Pairs of a String | Easy | ArrayStringTrie |
| 294 | Integer to English Words | Hard | MathStringRecursion |
| 295 | Integer to Roman | Medium | Hash TableMathString |
| 296 | Interleaving String | Medium | StringDynamic Programming |
| 297 | Invalid Transactions | Medium | ArrayHash TableString |
| 298 | IP to CIDR | Medium | StringBit Manipulation |
| 299 | Is Subsequence | Easy | Two PointersStringDynamic Programming |
| 300 | Isomorphic Strings | Easy | Hash TableString |
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