LeetCode_回溯_困难_52.N皇后 II

星许辰发布时间：2021-09-06 19:16:15 ，浏览量：0

1.题目
2.思路
3.代码实现（Java）

1.题目

n 皇后问题研究的是如何将 n 个皇后放置在 n×n 的棋盘上，并且使皇后彼此之间不能相互攻击。给你一个整数 n ，返回 n 皇后问题不同的解决方案的数量。

示例 1：在这里插入图片描述

输入：n = 4 输出：2 解释：如上图所示，4 皇后问题存在两个不同的解法。

示例 2：输入：n = 1 输出：1

提示： 1

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