Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 121 | Avoid Flood in The City | Medium | ArrayHash TableBinary Search |
| 122 | Bag of Tokens | Medium | ArrayTwo PointersGreedy |
| 123 | Balance a Binary Search Tree | Medium | Divide and ConquerGreedyTree |
| 124 | Balanced Binary Tree | Easy | TreeDepth-First SearchBinary Tree |
| 125 | Base 7 | Easy | MathString |
| 126 | Baseball Game | Easy | ArrayStackSimulation |
| 127 | Basic Calculator | Hard | MathStringStack |
| 128 | Basic Calculator II | Medium | MathStringStack |
| 129 | Battleships in a Board | Medium | ArrayDepth-First SearchMatrix |
| 130 | Beautiful Arrangement | Medium | ArrayDynamic ProgrammingBacktracking |
| 131 | Beautiful Arrangement II | Medium | ArrayMath |
| 132 | Beautiful Array | Medium | ArrayMathDivide and Conquer |
| 133 | Beautiful Pairs | Hard | ArrayMathDivide and Conquer |
| 134 | Beautiful Towers I | Medium | ArrayStackMonotonic Stack |
| 135 | Beautiful Towers II | Medium | ArrayStackMonotonic Stack |
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