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NeetCode 150 / Arrays & Hashing
01.07 · Problem

Valid Sudoku

Medium Hash sets per row, column and box 1 video LC 36 Pro

This problem is part of solulu Pro

You are given a partially filled 9 × 9 Sudoku board. Empty cells are '.'. Decide whether the filled cells are valid so far:

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Item 7 of 9 · updated 2026-10-12