Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 541 | Count Prefix and Suffix Pairs II | Hard | ArrayStringTrie |
| 542 | Count Prefixes of a Given String | Easy | ArrayString |
| 543 | Count Prime-Gap Balanced Subarrays | Medium | ArrayMathQueue |
| 544 | Count Primes | Medium | ArrayMathEnumeration |
| 545 | Count Salary Categories | Medium | Database |
| 546 | Count Servers that Communicate | Medium | ArrayDepth-First SearchBreadth-First Search |
| 547 | Count Sorted Vowel Strings | Medium | MathDynamic ProgrammingCombinatorics |
| 548 | Count Special Integers | Hard | MathDynamic Programming |
| 549 | Count Special Quadruplets | Easy | ArrayHash TableEnumeration |
| 550 | Count Special Subsequences | Medium | ArrayHash TableMath |
| 551 | Count Special Triplets | Medium | ArrayHash TableCounting |
| 552 | Count Square Submatrices with All Ones | Medium | ArrayDynamic ProgrammingMatrix |
| 553 | Count Square Sum Triples | Easy | MathEnumeration |
| 554 | Count Stepping Numbers in Range | Hard | StringDynamic Programming |
| 555 | Count Strictly Increasing Subarrays | Medium | ArrayMathDynamic Programming |
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