题目: Follow up for N-Queens problem. Now, instead outputting board configurations, return the total number of distinct solutions. Example For n=4, there are 2 distinct solutions. 题解: Solution 1 () class Solution { public: void dfs(int &res, int n, vec…

题目: 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 all distinct solutions to the n-queens puzzle. Each solution contains a distinct board configuration…

题目: Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each number in C may only be used once in the combination.  Example Given candidate set [10,1,6,7,2,1,5]…

[SPOJ]Longest Common Substring II (后缀自动机) 题面 Vjudge 题意:求若干个串的最长公共子串 题解 对于某一个串构建\(SAM\) 每个串依次进行匹配 同时记录\(f[i]\)表示走到了\(i\)节点 能够匹配上的最长公共子串的长度 当然,每个串的\(f[i]\)可以更新\(f[i.parent]\) 所以需要拓扑排序 对于每个串求出每个节点的最长匹配 然后对他们取\(min\),表示某个节点大家都能匹配的最长长度 最后对于所有点的值都取个\(max\)…

[Python] 零碎知识积累 II ■ 函数的参数默认值在函数定义时确定并保存在内存中,调用函数时不会在内存中新开辟一块空间然后用参数默认值重新赋值,而是单纯地引用这个参数原来的地址.这就带来了一个坑,那就是当你在函数体中对默认参数做一些改变的时候,若参数默认值是int,str这种不可变类型,那么还好,因为默认参数在内存中并没改变,只是参数指向另一块空间:但若是list这种可变类型,当你对默认参数做改变的时候,将会直接影响这个参数在内存中实际的值,这也就影响了下次调用这个函数时参数的默认值.比…

[BZOJ3569]DZY Loves Chinese II 题面 bzoj 题目大意: 给你一张\(N(1\leq N\leq 10^5)\)个点\(M(1\leq M\leq 5\times 10^5)\)条边的无向图,有\(Q(1\leq Q\leq 5\times 10^4)\)次询问,每次询问问你删去\(K(1\leq K\leq 15)\)条给定边后图的连通性是否改变. 题解 首先有一个很自然的想法就是把这个图的dfs树搞出来(其实随便一棵生成树都行). 考虑一下怎样删去边会造成连通…

[SPOJ]Longest Common Substring II 多个字符串求最长公共子串 还是将一个子串建SAM,其他字符串全部跑一边,记录每个点的最大贡献 由于是所有串,要对每个点每个字符串跑完后去最小值才是每个点的最终贡献 #include<iostream> #include<cstdio> #include<cstdlib> #include<cstring> #include<cmath> #include<algorithm…

[LeetCode]Pascal's Triangle II 解题报告 标签(空格分隔): LeetCode 题目地址:https://leetcode.com/problems/pascals-triangle-ii/description/ 题目描述: Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3, Return [1,3,3,1]. Note: Could yo…

[LeetCode]731. My Calendar II 解题报告(Python) 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址:https://leetcode.com/problems/my-calendar-ii/description/ 题目描述: Implement a MyCalendarTwo class to store your events. A new event can be added if…

[LeetCode]137. Single Number II 解题报告(Python) 标签: LeetCode 题目地址:https://leetcode.com/problems/single-number-ii/description/ 题目描述: Given an array of integers, every element appears three times except for one, which appears exactly once. Find that singl…