Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 616 | Count Unhappy Friends | Medium | ArraySimulation |
| 617 | Count Unique Characters of All Substrings of a Given String | Hard | Hash TableStringDynamic Programming |
| 618 | Count Univalue Subtrees | Medium | TreeDepth-First SearchBinary Tree |
| 619 | Count Unreachable Pairs of Nodes in an Undirected Graph | Medium | Depth-First SearchBreadth-First SearchUnion Find |
| 620 | Count Valid Paths in a Tree | Hard | MathDynamic ProgrammingTree |
| 621 | Count Visited Nodes in a Directed Graph | Hard | Dynamic ProgrammingGraphMemoization |
| 622 | Count Vowel Strings in Ranges | Medium | ArrayStringPrefix Sum |
| 623 | Count Vowel Substrings of a String | Easy | Hash TableString |
| 624 | Count Vowels Permutation | Hard | Dynamic Programming |
| 625 | Count Ways To Build Good Strings | Medium | Dynamic Programming |
| 626 | Count Ways to Build Rooms in an Ant Colony | Hard | MathDynamic ProgrammingTree |
| 627 | Count Ways to Distribute Candies | Hard | Dynamic Programming |
| 628 | Count Ways to Group Overlapping Ranges | Medium | ArraySorting |
| 629 | Count Ways to Make Array With Product | Hard | ArrayMathDynamic Programming |
| 630 | Count Words Obtained After Adding a Letter | Medium | ArrayHash TableString |
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