Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 406 | Count Number of Homogenous Substrings | Medium | MathString |
| 407 | Count Number of Maximum Bitwise-OR Subsets | Medium | ArrayBacktrackingBit Manipulation |
| 408 | Count Number of Pairs With Absolute Difference K | Easy | ArrayHash TableCounting |
| 409 | Count Number of Possible Root Nodes | Hard | ArrayHash TableDynamic Programming |
| 410 | Count Number of Rectangles Containing Each Point | Medium | ArrayHash TableBinary Search |
| 411 | Count Number of Special Subsequences | Hard | ArrayDynamic Programming |
| 412 | Count Number of Teams | Medium | ArrayDynamic ProgrammingBinary Indexed Tree |
| 413 | Count Number of Texts | Medium | Hash TableMathString |
| 414 | Count Number of Ways to Place Houses | Medium | Dynamic Programming |
| 415 | Count Numbers with Non-Decreasing Digits | Unknown | MathStringDynamic Programming |
| 416 | Count Numbers with Unique Digits | Medium | MathDynamic ProgrammingBacktracking |
| 417 | Count Occurrences in Text | Medium | Database |
| 418 | Count Odd Letters from Number | Easy | Hash TableStringSimulation |
| 419 | Count of Integers | Hard | MathStringDynamic Programming |
| 420 | Count of Interesting Subarrays | Medium | ArrayHash TablePrefix Sum |
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