leetcode回溯法题目解法若干
N皇后问题 * N-Queens * N-Queens II import java.util.ArrayList; import java.util.List; /* * @lc app=leetcode id=51 lang=java * * [51] N-Queens */ public class Solution { List<List<String>> result = new ArrayList<>(); private static int total = 0; public List<List<String&