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leetcode/problem/search-a-2d-matrix.html
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<p>Write an efficient algorithm that searches for a value <code>target</code> in an <code>m x n</code> integer matrix <code>matrix</code>. This matrix has the following properties:</p>
<p>You are given an <code>m x n</code> integer matrix <code>matrix</code> with the following two properties:</p>
<ul>
<li>Integers in each row are sorted from left to right.</li>
<li>Each row is sorted in non-decreasing order.</li>
<li>The first integer of each row is greater than the last integer of the previous row.</li>
</ul>
<p>Given an integer <code>target</code>, return <code>true</code> <em>if</em> <code>target</code> <em>is in</em> <code>matrix</code> <em>or</em> <code>false</code> <em>otherwise</em>.</p>
<p>You must write a solution in <code>O(log(m * n))</code> time complexity.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<p><strong class="example">Example 1:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/10/05/mat.jpg" style="width: 322px; height: 242px;" />
<pre>
<strong>Input:</strong> matrix = [[1,3,5,7],[10,11,16,20],[23,30,34,60]], target = 3
<strong>Output:</strong> true
</pre>
<p><strong>Example 2:</strong></p>
<p><strong class="example">Example 2:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/10/05/mat2.jpg" style="width: 322px; height: 242px;" />
<pre>
<strong>Input:</strong> matrix = [[1,3,5,7],[10,11,16,20],[23,30,34,60]], target = 13