Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1 | 3Sum With Multiplicity | Medium | ArrayHash TableTwo Pointers |
| 2 | 4Sum II | Medium | ArrayHash Table |
| 3 | Add Bold Tag in String | Medium | ArrayHash TableString |
| 4 | Add Edges to Make Degrees of All Nodes Even | Hard | Hash TableGraph |
| 5 | Alert Using Same Key-Card Three or More Times in a One Hour Period | Medium | ArrayHash TableString |
| 6 | All Nodes Distance K in Binary Tree | Medium | Hash TableTreeDepth-First Search |
| 7 | All O`one Data Structure | Hard | Hash TableLinked ListDesign |
| 8 | Alphabet Board Path | Medium | Hash TableString |
| 9 | Alt and Tab Simulation | Medium | ArrayHash TableSimulation |
| 10 | Amount of Time for Binary Tree to Be Infected | Medium | Hash TableTreeDepth-First Search |
| 11 | Analyze User Website Visit Pattern | Medium | ArrayHash TableString |
| 12 | Apply Discount Every n Orders | Medium | ArrayHash TableDesign |
| 13 | Apply Operations on Array to Maximize Sum of Squares | Hard | ArrayHash TableGreedy |
| 14 | Apply Operations to Make String Empty | Medium | ArrayHash TableSorting |
| 15 | Apply Substitutions | Medium | ArrayHash TableString |
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