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algorithm / algorithms / array / arrays / ascii / binary-search / bubble-sort / bucket-sort / combinatorics / competitive programming / data-structures / depth-first-search / graph-algorithms / hash-set / hash-table / hashmap / heap / inclusion-exclusion / leetcode / leetcode-easy / linear-scan / matrix / optimization / prefix-sum / searching / sorting / string-manipulation / tree-traversal / two-pointers

December 3, 2025

36. Valid Sudoku

Master the art of validating Sudoku boards efficiently using hash sets and fixed-size arrays with O(1) complexity.

algorithm data-structures hash-table matrix array