Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 136 | Count Unique Characters of All Substrings of a Given String | Hard | Hash TableStringDynamic Programming |
| 137 | Count Vowel Strings in Ranges | Medium | ArrayStringPrefix Sum |
| 138 | Count Vowel Substrings of a String | Easy | Hash TableString |
| 139 | Count Words Obtained After Adding a Letter | Medium | ArrayHash TableString |
| 140 | Counting Words With a Given Prefix | Easy | ArrayStringString Matching |
| 141 | Crawler Log Folder | Easy | ArrayStringStack |
| 142 | Custom Sort String | Medium | Hash TableStringSorting |
| 143 | Day of the Year | Easy | MathString |
| 144 | Decode String | Medium | StringStackRecursion |
| 145 | Decode the Message | Easy | Hash TableString |
| 146 | Decode the Slanted Ciphertext | Medium | StringSimulation |
| 147 | Decode Ways | Medium | StringDynamic Programming |
| 148 | Decode Ways II | Hard | StringDynamic Programming |
| 149 | Decoded String at Index | Medium | StringStack |
| 150 | Decremental String Concatenation | Medium | ArrayStringDynamic Programming |
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