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count-negative-numbers-in-a-sorted-matrix.json
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{
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"title": "Count Negative Numbers in a Sorted Matrix",
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"content": "<p>Given a <code>m x n</code> matrix <code>grid</code> which is sorted in non-increasing order both row-wise and column-wise, return <em>the number of <strong>negative</strong> numbers in</em> <code>grid</code>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> grid = [[4,3,2,-1],[3,2,1,-1],[1,1,-1,-2],[-1,-1,-2,-3]]\n<strong>Output:</strong> 8\n<strong>Explanation:</strong> There are 8 negatives number in the matrix.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> grid = [[3,2],[1,0]]\n<strong>Output:</strong> 0\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>m == grid.length</code></li>\n\t<li><code>n == grid[i].length</code></li>\n\t<li><code>1 <= m, n <= 100</code></li>\n\t<li><code>-100 <= grid[i][j] <= 100</code></li>\n</ul>\n\n<p> </p>\n<strong>Follow up:</strong> Could you find an <code>O(n + m)</code> solution?",
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