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54 lines
2.2 KiB
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54 lines
2.2 KiB
HTML
<p>给你一个大小为 <code>rows x cols</code> 的矩阵 <code>grid</code> 。最初，你位于左上角 <code>(0, 0)</code> ，每一步，你可以在矩阵中 <strong>向右</strong> 或 <strong>向下</strong> 移动。</p>
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<p>在从左上角 <code>(0, 0)</code> 开始到右下角 <code>(rows - 1, cols - 1)</code> 结束的所有路径中，找出具有 <strong>最大非负积</strong> 的路径。路径的积是沿路径访问的单元格中所有整数的乘积。</p>
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<p>返回 <strong>最大非负积 </strong>对<strong><em> </em><code>10<sup>9</sup> + 7</code></strong> <strong>取余</strong> 的结果。如果最大积为负数，则返回<em> </em><code>-1</code> 。</p>
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<p><strong>注意，</strong>取余是在得到最大积之后执行的。</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>grid = [[-1,-2,-3],
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[-2,-3,-3],
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[-3,-3,-2]]
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<strong>输出：</strong>-1
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<strong>解释：</strong>从 (0, 0) 到 (2, 2) 的路径中无法得到非负积，所以返回 -1
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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>grid = [[<strong>1</strong>,-2,1],
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[<strong>1</strong>,<strong>-2</strong>,1],
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[3,<strong>-4</strong>,<strong>1</strong>]]
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<strong>输出：</strong>8
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<strong>解释：</strong>最大非负积对应的路径已经用粗体标出 (1 * 1 * -2 * -4 * 1 = 8)
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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>grid = [[<strong>1</strong>, 3],
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[<strong>0</strong>,<strong>-4</strong>]]
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<strong>输出：</strong>0
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<strong>解释：</strong>最大非负积对应的路径已经用粗体标出 (1 * 0 * -4 = 0)
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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>grid = [[ <strong>1</strong>, 4,4,0],
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[<strong>-2</strong>, 0,0,1],
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[ <strong>1</strong>,<strong>-1</strong>,<strong>1</strong>,<strong>1</strong>]]
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<strong>输出：</strong>2
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<strong>解释：</strong>最大非负积对应的路径已经用粗体标出 (1 * -2 * 1 * -1 * 1 * 1 = 2)
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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>1 <= rows, cols <= 15</code></li>
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<li><code>-4 <= grid[i][j] <= 4</code></li>
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</ul>
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