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62 lines
2.3 KiB
HTML
62 lines
2.3 KiB
HTML
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<p>请你判断一个 <code>9 x 9</code> 的数独是否有效。只需要<strong> 根据以下规则</strong> ，验证已经填入的数字是否有效即可。</p>
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<ol>
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<li>数字 <code>1-9</code> 在每一行只能出现一次。</li>
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<li>数字 <code>1-9</code> 在每一列只能出现一次。</li>
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<li>数字 <code>1-9</code> 在每一个以粗实线分隔的 <code>3x3</code> 宫内只能出现一次。（请参考示例图）</li>
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</ol>
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<p> </p>
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<p><strong>注意：</strong></p>
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<ul>
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<li>一个有效的数独（部分已被填充）不一定是可解的。</li>
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<li>只需要根据以上规则，验证已经填入的数字是否有效即可。</li>
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<li>空白格用 <code>'.'</code> 表示。</li>
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</ul>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<img src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2021/04/12/250px-sudoku-by-l2g-20050714svg.png" style="height:250px; width:250px" />
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<pre>
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<strong>输入：</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>输出：</strong>true
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</pre>
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<p><strong>示例 2：</strong></p>
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<pre>
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<strong>输入：</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>输出：</strong>false
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<strong>解释：</strong>除了第一行的第一个数字从<strong> 5</strong> 改为 <strong>8 </strong>以外，空格内其他数字均与 示例1 相同。 但由于位于左上角的 3x3 宫内有两个 8 存在, 因此这个数独是无效的。</pre>
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<p> </p>
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<p><strong>提示：</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> 是一位数字（<code>1-9</code>）或者 <code>'.'</code></li>
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</ul>
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