add leetcode problem-cn part1

算法题（国内版）/problem (Chinese)/重新排列数组 [shuffle-the-array].html

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+<p>给你一个数组 <code>nums</code> ，数组中有 <code>2n</code> 个元素，按 <code>[x<sub>1</sub>,x<sub>2</sub>,...,x<sub>n</sub>,y<sub>1</sub>,y<sub>2</sub>,...,y<sub>n</sub>]</code> 的格式排列。</p>
+
+<p>请你将数组按 <code>[x<sub>1</sub>,y<sub>1</sub>,x<sub>2</sub>,y<sub>2</sub>,...,x<sub>n</sub>,y<sub>n</sub>]</code> 格式重新排列，返回重排后的数组。</p>
+
+<p>&nbsp;</p>
+
+<p><strong>示例 1：</strong></p>
+
+<pre><strong>输入：</strong>nums = [2,5,1,3,4,7], n = 3
+<strong>输出：</strong>[2,3,5,4,1,7] 
+<strong>解释：</strong>由于 x<sub>1</sub>=2, x<sub>2</sub>=5, x<sub>3</sub>=1, y<sub>1</sub>=3, y<sub>2</sub>=4, y<sub>3</sub>=7 ，所以答案为 [2,3,5,4,1,7]
+</pre>
+
+<p><strong>示例 2：</strong></p>
+
+<pre><strong>输入：</strong>nums = [1,2,3,4,4,3,2,1], n = 4
+<strong>输出：</strong>[1,4,2,3,3,2,4,1]
+</pre>
+
+<p><strong>示例 3：</strong></p>
+
+<pre><strong>输入：</strong>nums = [1,1,2,2], n = 2
+<strong>输出：</strong>[1,2,1,2]
+</pre>
+
+<p>&nbsp;</p>
+
+<p><strong>提示：</strong></p>
+
+<ul>
+	<li><code>1 &lt;= n &lt;= 500</code></li>
+	<li><code>nums.length == 2n</code></li>
+	<li><code>1 &lt;= nums[i] &lt;= 10^3</code></li>
+</ul>