Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 3106 | Substring with Concatenation of All Words | Hard | Hash TableStringSliding Window |
| 3107 | Substring With Largest Variance | Hard | ArrayDynamic Programming |
| 3108 | Substring XOR Queries | Medium | ArrayHash TableString |
| 3109 | Substrings of Size Three with Distinct Characters | Easy | Hash TableStringSliding Window |
| 3110 | Substrings That Begin and End With the Same Letter | Medium | Hash TableMathString |
| 3111 | Subtract the Product and Sum of Digits of an Integer | Easy | Math |
| 3112 | Subtree Inversion Sum | Hard | ArrayDynamic ProgrammingTree |
| 3113 | Subtree of Another Tree | Easy | TreeDepth-First SearchString Matching |
| 3114 | Subtree Removal Game with Fibonacci Tree | Hard | MathDynamic ProgrammingTree |
| 3115 | Successful Pairs of Spells and Potions | Medium | ArrayTwo PointersBinary Search |
| 3116 | Sudoku Solver | Hard | ArrayHash TableBacktracking |
| 3117 | Sum Game | Medium | MathStringGreedy |
| 3118 | Sum in a Matrix | Medium | ArraySortingHeap (Priority Queue) |
| 3119 | Sum Multiples | Easy | Math |
| 3120 | Sum of Absolute Differences in a Sorted Array | Medium | ArrayMathPrefix Sum |
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