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add leetcode problem-cn part6

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算法题（国内版）/problem (Chinese)/螺旋矩阵 II [spiral-matrix-ii].html Normal file
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<p>给你一个正整数 <code>n</code> ，生成一个包含 <code>1</code> 到 <code>n<sup>2</sup></code> 所有元素，且元素按顺时针顺序螺旋排列的 <code>n x n</code> 正方形矩阵 <code>matrix</code> 。</p>
<p> </p>
<p><strong>示例 1：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/11/13/spiraln.jpg" style="width: 242px; height: 242px;" />
<pre>
<strong>输入：</strong>n = 3
<strong>输出：</strong>[[1,2,3],[8,9,4],[7,6,5]]
</pre>
<p><strong>示例 2：</strong></p>
<pre>
<strong>输入：</strong>n = 1
<strong>输出：</strong>[[1]]
</pre>
<p> </p>
<p><strong>提示：</strong></p>
<ul>
<li><code>1 <= n <= 20</code></li>
</ul>