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add leetcode problem-cn part2

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<p>给定一个不含重复数字的整数数组 <code>nums</code> ,返回其 <strong>所有可能的全排列</strong> 。可以 <strong>按任意顺序</strong> 返回答案。</p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<pre>
<strong>输入:</strong>nums = [1,2,3]
<strong>输出:</strong>[[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]]
</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>nums = [0,1]
<strong>输出:</strong>[[0,1],[1,0]]
</pre>
<p><strong>示例 3</strong></p>
<pre>
<strong>输入:</strong>nums = [1]
<strong>输出:</strong>[[1]]
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 &lt;= nums.length &lt;= 6</code></li>
<li><code>-10 &lt;= nums[i] &lt;= 10</code></li>
<li><code>nums</code> 中的所有整数 <strong>互不相同</strong></li>
</ul>
<p>&nbsp;</p>
<p><meta charset="UTF-8" />注意:本题与主站 46&nbsp;题相同:<a href="https://leetcode-cn.com/problems/permutations/">https://leetcode-cn.com/problems/permutations/</a>&nbsp;</p>