Practice problems across 75+ categories
Practice problems frequently asked at Amazon • 3399 problems | 851 Easy | 1772 Medium | 756 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 511 | Count Numbers With Unique Digits II | Easy | Hash TableMathDynamic Programming |
| 512 | Count Occurrences in Text | Medium | Database |
| 513 | Count Odd Letters from Number | Easy | Hash TableStringSimulation |
| 514 | Count Odd Numbers in an Interval Range | Easy | Math |
| 515 | Count of Integers | Hard | MathStringDynamic Programming |
| 516 | Count of Interesting Subarrays | Medium | ArrayHash TablePrefix Sum |
| 517 | Count of Matches in Tournament | Easy | MathSimulation |
| 518 | Count of Range Sum | Hard | ArrayBinary SearchDivide and Conquer |
| 519 | Count of Smaller Numbers After Self | Hard | ArrayBinary SearchDivide and Conquer |
| 520 | Count of Sub-Multisets With Bounded Sum | Hard | ArrayHash TableDynamic Programming |
| 521 | Count of Substrings Containing Every Vowel and K Consonants I | Medium | Hash TableStringSliding Window |
| 522 | Count of Substrings Containing Every Vowel and K Consonants II | Medium | Hash TableStringSliding Window |
| 523 | Count Operations to Obtain Zero | Easy | MathSimulation |
| 524 | Count Pairs in Two Arrays | Medium | ArrayTwo PointersBinary Search |
| 525 | Count Pairs of Connectable Servers in a Weighted Tree Network | Medium | ArrayTreeDepth-First Search |
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