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leetcode-problemset/leetcode-cn/problem (Chinese)/下降路径最小和 II [minimum-falling-path-sum-ii].html

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<p>给你一个&nbsp;<code>n x n</code> 整数矩阵&nbsp;<code>grid</code>&nbsp;,请你返回 <strong>非零偏移下降路径</strong> 数字和的最小值。</p>
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<p><strong>非零偏移下降路径</strong> 定义为:从&nbsp;<code>grid</code> 数组中的每一行选择一个数字,且按顺序选出来的数字中,相邻数字不在原数组的同一列。</p>
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<p>&nbsp;</p>
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<p><strong class="example">示例 1</strong></p>
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<p><img alt="" src="https://assets.leetcode.com/uploads/2021/08/10/falling-grid.jpg" style="width: 244px; height: 245px;" /></p>
<pre>
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<strong>输入:</strong>grid = [[1,2,3],[4,5,6],[7,8,9]]
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<strong>输出:</strong>13
<strong>解释:</strong>
所有非零偏移下降路径包括:
[1,5,9], [1,5,7], [1,6,7], [1,6,8],
[2,4,8], [2,4,9], [2,6,7], [2,6,8],
[3,4,8], [3,4,9], [3,5,7], [3,5,9]
下降路径中数字和最小的是&nbsp;[1,5,7] ,所以答案是&nbsp;13 。
</pre>
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<p><strong class="example">示例 2</strong></p>
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<pre>
<strong>输入:</strong>grid = [[7]]
<strong>输出:</strong>7
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>n == grid.length == grid[i].length</code></li>
<li><code>1 &lt;= n &lt;= 200</code></li>
<li><code>-99 &lt;= grid[i][j] &lt;= 99</code></li>
</ul>