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34 lines
1.1 KiB
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34 lines
1.1 KiB
HTML
<p>编写一个高效的算法来判断 <code>m x n</code> 矩阵中，是否存在一个目标值。该矩阵具有如下特性：</p>
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<ul>
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<li>每行中的整数从左到右按升序排列。</li>
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<li>每行的第一个整数大于前一行的最后一个整数。</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 alt="" src="https://assets.leetcode.com/uploads/2020/10/05/mat.jpg" style="width: 322px; height: 242px;" />
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<pre>
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<strong>输入：</strong>matrix = [[1,3,5,7],[10,11,16,20],[23,30,34,60]], target = 3
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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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<img alt="" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/11/25/mat2.jpg" style="width: 322px; height: 242px;" />
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<pre>
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<strong>输入：</strong>matrix = [[1,3,5,7],[10,11,16,20],[23,30,34,60]], target = 13
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<strong>输出：</strong>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 <= m, n <= 100</code></li>
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<li><code>-10<sup>4</sup> <= matrix[i][j], target <= 10<sup>4</sup></code></li>
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</ul>
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