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leetcode-cn/problem (Chinese)/N皇后 II [n-queens-ii].html Normal file
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<p><strong>n&nbsp;皇后问题</strong> 研究的是如何将 <code>n</code>&nbsp;个皇后放置在 <code>n × n</code> 的棋盘上，并且使皇后彼此之间不能相互攻击。</p>
<p>给你一个整数 <code>n</code> ，返回 <strong>n 皇后问题</strong> 不同的解决方案的数量。</p>
<p>&nbsp;</p>
<div class="original__bRMd">
<div>
<p><strong>示例 1：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/11/13/queens.jpg" style="width: 600px; height: 268px;" />
<pre>
<strong>输入：</strong>n = 4
<strong>输出：</strong>2
<strong>解释：</strong>如上图所示，4 皇后问题存在两个不同的解法。
</pre>
<p><strong>示例 2：</strong></p>
<pre>
<strong>输入：</strong>n = 1
<strong>输出：</strong>1
</pre>
<p>&nbsp;</p>
<p><strong>提示：</strong></p>
<ul>
<li><code>1 &lt;= n &lt;= 9</code></li>
</ul>
</div>
</div>