Practice problems across 75+ categories
Practice problems frequently asked at Google • 3407 problems | 851 Easy | 1775 Medium | 761 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 436 | Corporate Flight Bookings | Medium | ArrayPrefix Sum |
| 437 | Correct a Binary Tree | Medium | Hash TableTreeDepth-First Search |
| 438 | Count All Possible Routes | Hard | ArrayDynamic ProgrammingMemoization |
| 439 | Count All Valid Pickup and Delivery Options | Hard | MathDynamic ProgrammingCombinatorics |
| 440 | Count Almost Equal Pairs I | Medium | ArrayHash TableSorting |
| 441 | Count Almost Equal Pairs II | Hard | ArrayHash TableSorting |
| 442 | Count Alternating Subarrays | Medium | ArrayMath |
| 443 | Count Anagrams | Hard | Hash TableMathString |
| 444 | Count and Say | Medium | String |
| 445 | Count Apples and Oranges | Medium | Database |
| 446 | Count Array Pairs Divisible by K | Hard | ArrayMathNumber Theory |
| 447 | Count Artifacts That Can Be Extracted | Medium | ArrayHash TableSimulation |
| 448 | Count Artist Occurrences On Spotify Ranking List | Easy | Database |
| 449 | Count Asterisks | Easy | String |
| 450 | Count Beautiful Numbers | Hard | Dynamic Programming |
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