How to Solve Valid Sudoku Problem
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Valid Sudoku
Determine if a 9 x 9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules: Each row must contain the digits 1-9 without repetition. Each column must conta...
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Understanding the Valid Sudoku Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Determine if a 9 x 9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules: Each row must contain the digits 1-9 without repetition. Each column must contain the digits 1-9 without repetition. Each of the nine 3 x 3 sub-boxes of the grid must contain the digits 1-9 without repetition. Note: A Sudoku board (partially filled) could be valid but is not necessarily solvable. Only the filled cells need to be validated according to the mentioned rules.
Valid Sudoku
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How Interview Coder Helps
Get real-time assistance for Valid Sudoku problems during coding interviews. Interview Coder provides instant solutions and explanations.
Examples
board =trueboard =falseSame as Example 1, except with the 5 in the top left corner being modified to 8. Since there are two 8's in the top left 3x3 sub-box, it is invalid.
Constraints
board.length == 9board[i].length == 9board[i][j] is a digit 1-9 or '.'.How Interview Coder Helps with Leetcode Problems
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Frequently Asked Questions
Common questions about solving Valid Sudoku and using Interview Coder during coding interviews.
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