The n-queens puzzle is the problem of placing nqueens on an n×n chessboard such that no two queens attack each other. Given an integer n, return the number of distinct solutions to the n-queens puzzle. Example: Input: 4 Output: 2 Explanation: There a…
The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given an integer n, return the number of distinct solutions to the n-queens puzzle. Example: Input: 4 Output: 2 Explanation: There…
题目: Remove all elements from a linked list of integers that have value val. Example Given: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6 Return: 1 --> 2 --> 3 --> 4 --> 5 思路: 题意:有序列表里面去掉给定的元素 遍历发现相同的,就去掉,prev.next != null,发现…
The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given an integer n, return the number of distinct solutions to the n-queens puzzle. Example: Input: 4 Output: 2 Explanation: There…
Description Follow up for N-Queens problem. Now, instead outputting board configurations, return the total number of distinct solutions. 思路 递归方式 主要是要判断当前位置是否是合理位置,参考isValid函数 代码 class Solution { public: int totalNQueens(int n) { int res = 0; if(n ==…
