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add leetcode problem-cn part3

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算法题（国内版）/problem (Chinese)/和至少为 K 的最短子数组 [shortest-subarray-with-sum-at-least-k].html Normal file
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<p>给你一个整数数组 <code>nums</code> 和一个整数 <code>k</code> ，找出 <code>nums</code> 中和至少为 <code>k</code> 的 <strong>最短非空子数组</strong> ，并返回该子数组的长度。如果不存在这样的 <strong>子数组</strong> ，返回 <code>-1</code> 。</p>
<p><strong>子数组</strong> 是数组中 <strong>连续</strong> 的一部分。</p>
<p>&nbsp;</p>
<ol>
</ol>
<p><strong>示例 1：</strong></p>
<pre>
<strong>输入：</strong>nums = [1], k = 1
<strong>输出：</strong>1
</pre>
<p><strong>示例 2：</strong></p>
<pre>
<strong>输入：</strong>nums = [1,2], k = 4
<strong>输出：</strong>-1
</pre>
<p><strong>示例 3：</strong></p>
<pre>
<strong>输入：</strong>nums = [2,-1,2], k = 3
<strong>输出：</strong>3
</pre>
<p>&nbsp;</p>
<p><strong>提示：</strong></p>
<ul>
<li><code>1 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>
<li><code>-10<sup>5</sup> &lt;= nums[i] &lt;= 10<sup>5</sup></code></li>
<li><code>1 &lt;= k &lt;= 10<sup>9</sup></code></li>
</ul>