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Deven
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56 lines
2.4 KiB
Markdown
<h2><a href="https://leetcode.com/problems/valid-sudoku/">36. Valid Sudoku</a></h2><h3>Medium</h3><hr><div><p>Determine if a <code>9 x 9</code> Sudoku board is valid. Only the filled cells need to be validated <strong>according to the following rules</strong>:</p>
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<ol>
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<li>Each row must contain the digits <code>1-9</code> without repetition.</li>
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<li>Each column must contain the digits <code>1-9</code> without repetition.</li>
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<li>Each of the nine <code>3 x 3</code> sub-boxes of the grid must contain the digits <code>1-9</code> without repetition.</li>
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</ol>
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<p><strong>Note:</strong></p>
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<ul>
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<li>A Sudoku board (partially filled) could be valid but is not necessarily solvable.</li>
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<li>Only the filled cells need to be validated according to the mentioned rules.</li>
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</ul>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<img src="https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Sudoku-by-L2G-20050714.svg/250px-Sudoku-by-L2G-20050714.svg.png" style="height:250px; width:250px">
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<pre><strong>Input:</strong> board =
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[["5","3",".",".","7",".",".",".","."]
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,["6",".",".","1","9","5",".",".","."]
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,[".","9","8",".",".",".",".","6","."]
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,["8",".",".",".","6",".",".",".","3"]
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,["4",".",".","8",".","3",".",".","1"]
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,["7",".",".",".","2",".",".",".","6"]
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,[".","6",".",".",".",".","2","8","."]
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,[".",".",".","4","1","9",".",".","5"]
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,[".",".",".",".","8",".",".","7","9"]]
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<strong>Output:</strong> true
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre><strong>Input:</strong> board =
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[["8","3",".",".","7",".",".",".","."]
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,["6",".",".","1","9","5",".",".","."]
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,[".","9","8",".",".",".",".","6","."]
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,["8",".",".",".","6",".",".",".","3"]
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,["4",".",".","8",".","3",".",".","1"]
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,["7",".",".",".","2",".",".",".","6"]
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,[".","6",".",".",".",".","2","8","."]
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,[".",".",".","4","1","9",".",".","5"]
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,[".",".",".",".","8",".",".","7","9"]]
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<strong>Output:</strong> false
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<strong>Explanation:</strong> Same as Example 1, except with the <strong>5</strong> in the top left corner being modified to <strong>8</strong>. Since there are two 8's in the top left 3x3 sub-box, it is invalid.
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>board.length == 9</code></li>
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<li><code>board[i].length == 9</code></li>
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<li><code>board[i][j]</code> is a digit <code>1-9</code> or <code>'.'</code>.</li>
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</ul>
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</div> |