Practice problems across 75+ categories
Practice problems frequently asked at Hash Function • 39 problems | 4 Easy | 14 Medium | 19 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 1 | Check If a String Contains All Binary Codes of Size K | Medium | Hash TableStringBit Manipulation |
| 2 | Check if DFS Strings Are Palindromes | Hard | ArrayHash TableString |
| 3 | Count Cells in Overlapping Horizontal and Vertical Substrings | Medium | ArrayStringRolling Hash |
| 4 | Count Prefix and Suffix Pairs I | Easy | ArrayStringTrie |
| 5 | Count Prefix and Suffix Pairs II | Hard | ArrayStringTrie |
| 6 | Delete Duplicate Folders in System | Hard | ArrayHash TableString |
| 7 | Design HashMap | Easy | ArrayHash TableLinked List |
| 8 | Design HashSet | Easy | ArrayHash TableLinked List |
| 9 | Distinct Echo Substrings | Hard | StringTrieRolling Hash |
| 10 | Encode and Decode TinyURL | Medium | Hash TableStringDesign |
| 11 | Equalize Strings by Adding or Removing Characters at Ends | Medium | StringBinary SearchDynamic Programming |
| 12 | Find Beautiful Indices in the Given Array I | Medium | Two PointersStringBinary Search |
| 13 | Find Beautiful Indices in the Given Array II | Hard | Two PointersStringBinary Search |
| 14 | Find Pattern in Infinite Stream I | Medium | ArraySliding WindowRolling Hash |
| 15 | Find Pattern in Infinite Stream II | Hard | ArraySliding WindowRolling Hash |
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