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add leetcode problem-cn part6

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算法题（国内版）/problem (Chinese)/搜索二维矩阵 [search-a-2d-matrix].html Normal file
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<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>
<ul>
<li>每行中的整数从左到右按升序排列。</li>
<li>每行的第一个整数大于前一行的最后一个整数。</li>
</ul>
<p> </p>
<p><strong>示例 1：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/10/05/mat.jpg" style="width: 322px; height: 242px;" />
<pre>
<strong>输入：</strong>matrix = [[1,3,5,7],[10,11,16,20],[23,30,34,60]], target = 3
<strong>输出：</strong>true
</pre>
<p><strong>示例 2：</strong></p>
<img alt="" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/11/25/mat2.jpg" style="width: 322px; height: 242px;" />
<pre>
<strong>输入：</strong>matrix = [[1,3,5,7],[10,11,16,20],[23,30,34,60]], target = 13
<strong>输出：</strong>false
</pre>
<p> </p>
<p><strong>提示：</strong></p>
<ul>
<li><code>m == matrix.length</code></li>
<li><code>n == matrix[i].length</code></li>
<li><code>1 <= m, n <= 100</code></li>
<li><code>-10<sup>4</sup> <= matrix[i][j], target <= 10<sup>4</sup></code></li>
</ul>