Practice problems across 75+ categories
Practice problems frequently asked at Google • 3407 problems | 851 Easy | 1775 Medium | 761 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3121 | Subtree of Another Tree | Easy | TreeDepth-First SearchString Matching |
| 3122 | Subtree Removal Game with Fibonacci Tree | Hard | MathDynamic ProgrammingTree |
| 3123 | Successful Pairs of Spells and Potions | Medium | ArrayTwo PointersBinary Search |
| 3124 | Sudoku Solver | Hard | ArrayHash TableBacktracking |
| 3125 | Sum Game | Medium | MathStringGreedy |
| 3126 | Sum in a Matrix | Medium | ArraySortingHeap (Priority Queue) |
| 3127 | Sum Multiples | Easy | Math |
| 3128 | Sum of Absolute Differences in a Sorted Array | Medium | ArrayMathPrefix Sum |
| 3129 | Sum of All Odd Length Subarrays | Easy | ArrayMathPrefix Sum |
| 3130 | Sum of All Subset XOR Totals | Easy | ArrayMathBacktracking |
| 3131 | Sum of Beauty in the Array | Medium | Array |
| 3132 | Sum of Beauty of All Substrings | Medium | Hash TableStringCounting |
| 3133 | Sum of Consecutive Subarrays | Medium | ArrayTwo PointersDynamic Programming |
| 3134 | Sum of Consecutive Subsequences | Hard | ArrayHash TableDynamic Programming |
| 3135 | Sum of Digit Differences of All Pairs | Medium | ArrayHash TableMath |
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