Leetcode 36. Valid Sudoku
Check a 9x9 Sudoku board is valid by verifying that no digit 1–9 (ignoring '.') appears more than once in any row, column, or 3x3 sub-box. Return true if all these constraints hold for the partially filled board.
Asked at:
Microsoft
Amazon
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Mid May, 2026
Amazon
Senior
Late April, 2026
Microsoft
Mid-level
Hackerrank codepair round, was asked Valid Sudoku,I couldn't code running solution, I was able to explain the approach and solution verbally, then proceeded to write code, I was not able to properly understand how to check for inner squares.
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