Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 2656 | Subsequences with a Unique Middle Mode II | Hard | ArrayHash TableMath |
| 2657 | Subsets | Medium | ArrayBacktrackingBit Manipulation |
| 2658 | Subsets II | Medium | ArrayBacktrackingBit Manipulation |
| 2659 | Substring Matching Pattern | Easy | StringString Matching |
| 2660 | Substring with Concatenation of All Words | Hard | Hash TableStringSliding Window |
| 2661 | Substring With Largest Variance | Hard | ArrayDynamic Programming |
| 2662 | Substring XOR Queries | Medium | ArrayHash TableString |
| 2663 | Substrings of Size Three with Distinct Characters | Easy | Hash TableStringSliding Window |
| 2664 | Substrings That Begin and End With the Same Letter | Medium | Hash TableMathString |
| 2665 | Subtract the Product and Sum of Digits of an Integer | Easy | Math |
| 2666 | Subtree Inversion Sum | Hard | ArrayDynamic ProgrammingTree |
| 2667 | Subtree of Another Tree | Easy | TreeDepth-First SearchString Matching |
| 2668 | Subtree Removal Game with Fibonacci Tree | Hard | MathDynamic ProgrammingTree |
| 2669 | Successful Pairs of Spells and Potions | Medium | ArrayTwo PointersBinary Search |
| 2670 | Sum Game | Medium | MathStringGreedy |
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