Practice problems across 75+ categories
Practice problems frequently asked at Hash Table • 719 problems | 168 Easy | 418 Medium | 127 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 61 | Clone Graph | Medium | Hash TableDepth-First SearchBreadth-First Search |
| 62 | Clone N-ary Tree | Medium | Hash TableTreeDepth-First Search |
| 63 | Closest Equal Element Queries | Medium | ArrayHash TableBinary Search |
| 64 | Compare Strings by Frequency of the Smallest Character | Medium | ArrayHash TableString |
| 65 | Construct 2D Grid Matching Graph Layout | Hard | ArrayHash TableGraph |
| 66 | Construct Binary Tree from Inorder and Postorder Traversal | Medium | ArrayHash TableDivide and Conquer |
| 67 | Construct Binary Tree from Preorder and Inorder Traversal | Medium | ArrayHash TableDivide and Conquer |
| 68 | Construct Binary Tree from Preorder and Postorder Traversal | Medium | ArrayHash TableDivide and Conquer |
| 69 | Construct K Palindrome Strings | Medium | Hash TableStringGreedy |
| 70 | Construct String With Repeat Limit | Medium | Hash TableStringGreedy |
| 71 | Contains Duplicate | Easy | ArrayHash TableSorting |
| 72 | Contains Duplicate II | Easy | ArrayHash TableSliding Window |
| 73 | Contiguous Array | Medium | ArrayHash TablePrefix Sum |
| 74 | Continuous Subarray Sum | Medium | ArrayHash TableMath |
| 75 | Convert an Array Into a 2D Array With Conditions | Medium | ArrayHash Table |
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