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add leetcode problem-cn part6

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<p>给定两个以 <strong>升序排列</strong> 的整数数组 <code>nums1</code><strong> </strong><code>nums2</code><strong>&nbsp;</strong>,&nbsp;以及一个整数 <code>k</code><strong>&nbsp;</strong></p>
<p>定义一对值&nbsp;<code>(u,v)</code>,其中第一个元素来自&nbsp;<code>nums1</code>,第二个元素来自 <code>nums2</code><strong>&nbsp;</strong></p>
<p>请找到和最小的 <code>k</code>&nbsp;个数对&nbsp;<code>(u<sub>1</sub>,v<sub>1</sub>)</code>, <code>&nbsp;(u<sub>2</sub>,v<sub>2</sub>)</code> &nbsp;... &nbsp;<code>(u<sub>k</sub>,v<sub>k</sub>)</code>&nbsp;</p>
<p>&nbsp;</p>
<p><strong>示例 1:</strong></p>
<pre>
<strong>输入:</strong> nums1 = [1,7,11], nums2 = [2,4,6], k = 3
<strong>输出:</strong> [1,2],[1,4],[1,6]
<strong>解释: </strong>返回序列中的前 3 对数:
[1,2],[1,4],[1,6],[7,2],[7,4],[11,2],[7,6],[11,4],[11,6]
</pre>
<p><strong>示例 2:</strong></p>
<pre>
<strong>输入: </strong>nums1 = [1,1,2], nums2 = [1,2,3], k = 2
<strong>输出: </strong>[1,1],[1,1]
<strong>解释: </strong>返回序列中的前 2 对数:
&nbsp; [1,1],[1,1],[1,2],[2,1],[1,2],[2,2],[1,3],[1,3],[2,3]
</pre>
<p><strong>示例 3:</strong></p>
<pre>
<strong>输入: </strong>nums1 = [1,2], nums2 = [3], k = 3
<strong>输出:</strong> [1,3],[2,3]
<strong>解释: </strong>也可能序列中所有的数对都被返回:[1,3],[2,3]
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 &lt;= nums1.length, nums2.length &lt;= 10<sup>5</sup></code></li>
<li><code>-10<sup>9</sup> &lt;= nums1[i], nums2[i] &lt;= 10<sup>9</sup></code></li>
<li><code>nums1</code><code>nums2</code> 均为升序排列</li>
<li><code>1 &lt;= k &lt;= 1000</code></li>
</ul>