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37 lines
1.3 KiB
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37 lines
1.3 KiB
HTML
<p>编写一个高效的算法来搜索 <code><em>m</em> x <em>n</em></code> 矩阵 <code>matrix</code> 中的一个目标值 <code>target</code> 。该矩阵具有以下特性：</p>
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<ul>
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<li>每行的元素从左到右升序排列。</li>
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<li>每列的元素从上到下升序排列。</li>
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</ul>
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<p> </p>
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<p><b>示例 1：</b></p>
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<img alt="" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/11/25/searchgrid2.jpg" />
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<pre>
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<b>输入：</b>matrix = [[1,4,7,11,15],[2,5,8,12,19],[3,6,9,16,22],[10,13,14,17,24],[18,21,23,26,30]], target = 5
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<b>输出：</b>true
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</pre>
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<p><b>示例 2：</b></p>
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<img alt="" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/11/25/searchgrid.jpg" />
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<pre>
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<b>输入：</b>matrix = [[1,4,7,11,15],[2,5,8,12,19],[3,6,9,16,22],[10,13,14,17,24],[18,21,23,26,30]], target = 20
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<b>输出：</b>false
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</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>m == matrix.length</code></li>
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<li><code>n == matrix[i].length</code></li>
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<li><code>1 <= n, m <= 300</code></li>
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<li><code>-10<sup>9</sup> <= matrix[i][j] <= 10<sup>9</sup></code></li>
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<li>每行的所有元素从左到右升序排列</li>
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<li>每列的所有元素从上到下升序排列</li>
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<li><code>-10<sup>9</sup> <= target <= 10<sup>9</sup></code></li>
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</ul>
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