n-queens-ii

Algorithms

N-Queens II

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totalNQueens

The n-queens 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.

Given an integer <code>n</code>, return the number of distinct solutions to the&nbsp;n-queens puzzle.

&nbsp;
Example 1:
<img alt="" src="https://assets.leetcode.com/uploads/2020/11/13/queens.jpg" style="width: 600px; height: 268px;" />
<pre>
Input: n = 4
Output: 2
Explanation: There are two distinct solutions to the 4-queens puzzle as shown.
</pre>

Example 2:

<pre>
Input: n = 1
Output: 1
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= n &lt;= 9</code></li>
</ul>

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