题目如下： There are prison cells in a row, and each cell is either occupied or vacant. Each day, whether the cell is occupied or vacant changes according to the following rules: If a cell has two adjacent ...
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There are 8 prison cells in a row, and each cell is either occupied or vacant. Each day, whether the cell is occupied or vacant changes according ...
Given the head of a linked list and two integers m and n. Traverse the linked list and remove some nodes in the following way: Start ...
题目如下： Given n and m which are the dimensions of a matrix initialized by zeros and given an array indices where indices[i] = [ri, ci ...
LeetCode wants to give one of its best employees the option to travel among N cities to collect algorithm problems. But all work and no play makes ...
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 ...
957. N 天后的牢房 思路： 模拟变换，当N天结合后返回 => 当N非常大的时候，超时 => 一般N很大的时候，这种题目必然存在循环，所以记录找过的状态，一旦出现已经访问过的状态可立即跳出循环。 825. 适龄的朋友 思路： 最直观的就是两层循环暴力，意料之中 ...
Hard！ 题目描述： 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。 上图为 8 皇后问题的一种解法。 给定一个整数 n，返回所有不同的 n 皇后问题的解决方案。 每一种解法包含一个明确的 n 皇后问题的棋子放置方案，该方案中 'Q ...
题目： 分析：很显然不能用时间复杂度为O(N2)的暴力穷举法，下面先给出一个运行时间为102ms的AC答案： 上面的答案虽然AC了，但若原始海量数据本身是降序排列时，再运行时间也为O(N2)，下面给出运用树状数组(Binary Indexed Tree ...
