Practice problems across 75+ categories
Practice problems frequently asked at String • 803 problems | 228 Easy | 390 Medium | 177 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 76 | Construct Binary Tree from String | Medium | StringStackTree |
| 77 | Construct K Palindrome Strings | Medium | Hash TableStringGreedy |
| 78 | Construct Smallest Number From DI String | Medium | StringBacktrackingStack |
| 79 | Construct String from Binary Tree | Medium | StringTreeDepth-First Search |
| 80 | Construct String with Minimum Cost | Hard | ArrayStringDynamic Programming |
| 81 | Construct String with Minimum Cost (Easy) | Unknown | StringTrieDynamic Programming |
| 82 | Construct String With Repeat Limit | Medium | Hash TableStringGreedy |
| 83 | Convert a Number to Hexadecimal | Easy | MathStringBit Manipulation |
| 84 | Convert Date to Binary | Easy | MathString |
| 85 | Count Anagrams | Hard | Hash TableMathString |
| 86 | Count and Say | Medium | String |
| 87 | Count Asterisks | Easy | String |
| 88 | Count Beautiful Substrings I | Medium | Hash TableMathString |
| 89 | Count Beautiful Substrings II | Hard | Hash TableMathString |
| 90 | Count Binary Substrings | Easy | Two PointersString |
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