Package g0001_0100.s0036_valid_sudoku
Class Solution
java.lang.Object
g0001_0100.s0036_valid_sudoku.Solution
36 - Valid Sudoku.<p>Medium</p>
<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>
<ol>
<li>Each row must contain the digits <code>1-9</code> without repetition.</li>
<li>Each column must contain the digits <code>1-9</code> without repetition.</li>
<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>
</ol>
<p><strong>Note:</strong></p>
<ul>
<li>A Sudoku board (partially filled) could be valid but is not necessarily solvable.</li>
<li>Only the filled cells need to be validated according to the mentioned rules.</li>
</ul>
<p><strong>Example 1:</strong></p>
<p><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Sudoku-by-L2G-20050714.svg/250px-Sudoku-by-L2G-20050714.svg.png" alt="" /></p>
<p><strong>Input:</strong></p>
<pre><code> board =
[["5","3",".",".","7",".",".",".","."]
,["6",".",".","1","9","5",".",".","."]
,[".","9","8",".",".",".",".","6","."]
,["8",".",".",".","6",".",".",".","3"]
,["4",".",".","8",".","3",".",".","1"]
,["7",".",".",".","2",".",".",".","6"]
,[".","6",".",".",".",".","2","8","."]
,[".",".",".","4","1","9",".",".","5"]
,[".",".",".",".","8",".",".","7","9"]]
</code></pre>
<p><strong>Output:</strong> true</p>
<p><strong>Example 2:</strong></p>
<p><strong>Input:</strong></p>
<pre><code> board =
[["8","3",".",".","7",".",".",".","."]
,["6",".",".","1","9","5",".",".","."]
,[".","9","8",".",".",".",".","6","."]
,["8",".",".",".","6",".",".",".","3"]
,["4",".",".","8",".","3",".",".","1"]
,["7",".",".",".","2",".",".",".","6"]
,[".","6",".",".",".",".","2","8","."]
,[".",".",".","4","1","9",".",".","5"]
,[".",".",".",".","8",".",".","7","9"]]
</code></pre>
<p><strong>Output:</strong> false</p>
<p><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.</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>board.length == 9</code></li>
<li><code>board[i].length == 9</code></li>
<li><code>board[i][j]</code> is a digit <code>1-9</code> or <code>'.'</code>.</li>
</ul>
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Constructor Summary
Constructors -
Method Summary
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Constructor Details
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Solution
public Solution()
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Method Details
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isValidSudoku
public boolean isValidSudoku(char[][] board)
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