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Description
tab: English
<p>The <strong>n-queens</strong> puzzle is the problem of placing <code>n</code> queens on an <code>n x n</code> chessboard such that no two queens attack each other.</p>
<p>Given an integer <code>n</code>, return <em>all distinct solutions to the <strong>n-queens puzzle</strong></em>. You may return the answer in <strong>any order</strong>.</p>
<p>Each solution contains a distinct board configuration of the n-queens' placement, where <code>'Q'</code> and <code>'.'</code> both indicate a queen and an empty space, respectively.</p>
<p> </p>
<p><strong class="example">Example 1:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/11/13/queens.jpg" style="width: 600px; height: 268px;" />
<pre>
<strong>Input:</strong> n = 4
<strong>Output:</strong> [[".Q..","...Q","Q...","..Q."],["..Q.","Q...","...Q",".Q.."]]
<strong>Explanation:</strong> There exist two distinct solutions to the 4-queens puzzle as shown above
</pre>
<p><strong class="example">Example 2:</strong></p>
<pre>
<strong>Input:</strong> n = 1
<strong>Output:</strong> [["Q"]]
</pre>
<p> </p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>1 <= n <= 9</code></li>
</ul>
---
[submissions](https://leetcode.com/problems/n-queens/submissions/) | [solutions](https://leetcode.com/problems/n-queens/solutions/)
tab: 中文
<p>按照国际象棋的规则，皇后可以攻击与之处在同一行或同一列或同一斜线上的棋子。</p>
<p><strong>n 皇后问题</strong> 研究的是如何将 <code>n</code> 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> ，返回所有不同的 <strong>n<em> </em>皇后问题</strong> 的解决方案。</p>
<div class="original__bRMd">
<div>
<p>每一种解法包含一个不同的 <strong>n 皇后问题</strong> 的棋子放置方案，该方案中 <code>'Q'</code> 和 <code>'.'</code> 分别代表了皇后和空位。</p>
<p> </p>
<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>[[".Q..","...Q","Q...","..Q."],["..Q.","Q...","...Q",".Q.."]]
<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>[["Q"]]
</pre>
<p> </p>
<p><strong>提示：</strong></p>
<ul>
<li><code>1 <= n <= 9</code></li>
</ul>
</div>
</div>
---
[提交记录](https://leetcode.cn/problems/n-queens/submissions/) | [题解](https://leetcode.cn/problems/n-queens/solution/)
Solutions & Notes
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