Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 271 | Find Valid Pair of Adjacent Digits in String | Easy | Hash TableStringCounting |
| 272 | Find Winner on a Tic Tac Toe Game | Easy | ArrayHash TableMatrix |
| 273 | Find Words That Can Be Formed by Characters | Easy | ArrayHash TableString |
| 274 | Find X-Sum of All K-Long Subarrays I | Easy | ArrayHash TableSliding Window |
| 275 | Find X-Sum of All K-Long Subarrays II | Hard | ArrayHash TableSliding Window |
| 276 | Finding 3-Digit Even Numbers | Easy | ArrayHash TableRecursion |
| 277 | Finding Pairs With a Certain Sum | Medium | ArrayHash TableDesign |
| 278 | Finding the Users Active Minutes | Medium | ArrayHash Table |
| 279 | First Completely Painted Row or Column | Medium | ArrayHash TableMatrix |
| 280 | First Letter to Appear Twice | Easy | Hash TableStringBit Manipulation |
| 281 | First Missing Positive | Hard | ArrayHash Table |
| 282 | First Unique Character in a String | Easy | Hash TableStringQueue |
| 283 | First Unique Number | Medium | ArrayHash TableDesign |
| 284 | Flip Columns For Maximum Number of Equal Rows | Medium | ArrayHash TableMatrix |
| 285 | Form Smallest Number From Two Digit Arrays | Easy | ArrayHash TableEnumeration |
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