Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 436 | Count Pairs With XOR in a Range | Hard | ArrayBit ManipulationTrie |
| 437 | Count Partitions with Even Sum Difference | Easy | ArrayMathPrefix Sum |
| 438 | Count Partitions With Max-Min Difference at Most K | Medium | ArrayDynamic ProgrammingQueue |
| 439 | Count Paths That Can Form a Palindrome in a Tree | Hard | Dynamic ProgrammingBit ManipulationTree |
| 440 | Count Paths With the Given XOR Value | Medium | ArrayDynamic ProgrammingBit Manipulation |
| 441 | Count Positions on Street With Required Brightness | Medium | ArrayPrefix Sum |
| 442 | Count Prefix and Suffix Pairs I | Easy | ArrayStringTrie |
| 443 | Count Prefix and Suffix Pairs II | Hard | ArrayStringTrie |
| 444 | Count Prefixes of a Given String | Easy | ArrayString |
| 445 | Count Prime-Gap Balanced Subarrays | Medium | ArrayMathQueue |
| 446 | Count Salary Categories | Medium | Database |
| 447 | Count Servers that Communicate | Medium | ArrayDepth-First SearchBreadth-First Search |
| 448 | Count Sorted Vowel Strings | Medium | MathDynamic ProgrammingCombinatorics |
| 449 | Count Special Integers | Hard | MathDynamic Programming |
| 450 | Count Special Quadruplets | Easy | ArrayHash TableEnumeration |
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