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54 lines
1.9 KiB
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<p>给你一个大小为 <code>rows x cols</code> 的矩阵 <code>mat</code>，其中 <code>mat[i][j]</code> 是 <code>0</code> 或 <code>1</code>，请返回 <strong>矩阵 <em><code>mat</code></em> 中特殊位置的数目</strong> 。</p>
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<p><strong>特殊位置</strong> 定义：如果 <code>mat[i][j] == 1</code> 并且第 <code>i</code> 行和第 <code>j</code> 列中的所有其他元素均为 <code>0</code>（行和列的下标均 <strong>从 0 开始</strong> ），则位置 <code>(i, j)</code> 被称为特殊位置。</p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<pre><strong>输入：</strong>mat = [[1,0,0],
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[0,0,<strong>1</strong>],
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[1,0,0]]
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<strong>输出：</strong>1
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<strong>解释：</strong>(1,2) 是一个特殊位置，因为 mat[1][2] == 1 且所处的行和列上所有其他元素都是 0
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</pre>
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<p><strong>示例 2：</strong></p>
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<pre><strong>输入：</strong>mat = [[<strong>1</strong>,0,0],
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[0,<strong>1</strong>,0],
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[0,0,<strong>1</strong>]]
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<strong>输出：</strong>3
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<strong>解释：</strong>(0,0), (1,1) 和 (2,2) 都是特殊位置
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</pre>
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<p><strong>示例 3：</strong></p>
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<pre><strong>输入：</strong>mat = [[0,0,0,<strong>1</strong>],
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[<strong>1</strong>,0,0,0],
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[0,1,1,0],
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[0,0,0,0]]
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<strong>输出：</strong>2
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</pre>
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<p><strong>示例 4：</strong></p>
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<pre><strong>输入：</strong>mat = [[0,0,0,0,0],
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[<strong>1</strong>,0,0,0,0],
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[0,<strong>1</strong>,0,0,0],
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[0,0,<strong>1</strong>,0,0],
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[0,0,0,1,1]]
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<strong>输出：</strong>3
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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>rows == mat.length</code></li>
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<li><code>cols == mat[i].length</code></li>
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<li><code>1 <= rows, cols <= 100</code></li>
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<li><code>mat[i][j]</code> 是 <code>0</code> 或 <code>1</code></li>
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</ul>
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