Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 526 | Count Pairs of Equal Substrings With Minimum Difference | Medium | Hash TableStringGreedy |
| 527 | Count Pairs Of Nodes | Hard | ArrayHash TableTwo Pointers |
| 528 | Count Pairs of Points With Distance k | Medium | ArrayHash TableBit Manipulation |
| 529 | Count Pairs Of Similar Strings | Easy | ArrayHash TableString |
| 530 | Count Pairs That Form a Complete Day I | Easy | ArrayHash TableCounting |
| 531 | Count Pairs That Form a Complete Day II | Medium | ArrayHash TableCounting |
| 532 | Count Pairs Whose Sum is Less than Target | Easy | ArrayTwo PointersBinary Search |
| 533 | Count Pairs With XOR in a Range | Hard | ArrayBit ManipulationTrie |
| 534 | Count Palindromic Subsequences | Hard | StringDynamic Programming |
| 535 | Count Partitions with Even Sum Difference | Easy | ArrayMathPrefix Sum |
| 536 | Count Partitions With Max-Min Difference at Most K | Medium | ArrayDynamic ProgrammingQueue |
| 537 | Count Paths That Can Form a Palindrome in a Tree | Hard | Dynamic ProgrammingBit ManipulationTree |
| 538 | Count Paths With the Given XOR Value | Medium | ArrayDynamic ProgrammingBit Manipulation |
| 539 | Count Positions on Street With Required Brightness | Medium | ArrayPrefix Sum |
| 540 | Count Prefix and Suffix Pairs I | Easy | ArrayStringTrie |
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