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leetcode-problemset/leetcode-cn/problem (Chinese)/K 次串联后最大子数组之和 [k-concatenation-maximum-sum].html
2022-03-29 12:43:11 +08:00

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<p>给定一个整数数组&nbsp;<code>arr</code>&nbsp;和一个整数&nbsp;<code>k</code>&nbsp;,通过重复&nbsp;<code>k</code>&nbsp;次来修改数组。</p>
<p>例如,如果&nbsp;<code>arr = [1, 2]</code>&nbsp;<meta charset="UTF-8" />&nbsp;<code>k = 3</code>&nbsp;,那么修改后的数组将是 <code>[1, 2, 1, 2, 1, 2]</code></p>
<p>返回修改后的数组中的最大的子数组之和。注意,子数组长度可以是 <code>0</code>,在这种情况下它的总和也是 <code>0</code></p>
<p>由于&nbsp;<strong>结果可能会很大</strong>,需要返回的<meta charset="UTF-8" />&nbsp;<code>10<sup>9</sup>&nbsp;+ 7</code>&nbsp;&nbsp;<strong></strong>&nbsp;</p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<pre>
<strong>输入:</strong>arr = [1,2], k = 3
<strong>输出:</strong>9
</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>arr = [1,-2,1], k = 5
<strong>输出:</strong>2
</pre>
<p><strong>示例 3</strong></p>
<pre>
<strong>输入:</strong>arr = [-1,-2], k = 7
<strong>输出:</strong>0
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<meta charset="UTF-8" />
<ul>
<li><code>1 &lt;= arr.length &lt;= 10<sup>5</sup></code></li>
<li><code>1 &lt;= k &lt;= 10<sup>5</sup></code></li>
<li><code>-10<sup>4</sup>&nbsp;&lt;= arr[i] &lt;= 10<sup>4</sup></code></li>
</ul>