Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 166 | Design File System | Medium | Hash TableStringDesign |
| 167 | Design In-Memory File System | Hard | Hash TableStringDesign |
| 168 | Design Log Storage System | Medium | Hash TableStringDesign |
| 169 | Design Search Autocomplete System | Hard | StringDepth-First SearchDesign |
| 170 | Design Spreadsheet | Medium | ArrayHash TableString |
| 171 | Design SQL | Medium | ArrayHash TableString |
| 172 | Design Underground System | Medium | Hash TableStringDesign |
| 173 | Destination City | Easy | ArrayHash TableString |
| 174 | Detect Capital | Easy | String |
| 175 | Determine Color of a Chessboard Square | Easy | MathString |
| 176 | Determine if String Halves Are Alike | Easy | StringCounting |
| 177 | Determine if Two Events Have Conflict | Easy | ArrayString |
| 178 | Determine if Two Strings Are Close | Medium | Hash TableStringSorting |
| 179 | DI String Match | Easy | ArrayTwo PointersString |
| 180 | Different Ways to Add Parentheses | Medium | MathStringDynamic Programming |
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