题意:给定N,M,然后给出M组信息(u,v,l,r),表示u到v有[l,r]范围的通行证有效.问有多少种通行证可以使得1和N连通. 思路:和bzoj魔法森林有点像,LCT维护最小生成树. 开始和队友在想维护连通性,而不是维护树,这样好像会很麻烦. 队友yy了一个算法:用线段树模拟并查集维护连通性.(发现和标程有点像? 我的代码:LCT维护最小生成树. ...先给代码,后面补一下题解. #include<bits/stdc++.h> #define ll long long using nam…
A. Broken Clock time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given a broken clock. You know, that it is supposed to show time in 12- or 24-hours HH:MM format. In 12-hours format…
Regroup Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1057 Accepted Submission(s): 297 Problem Description When ALPC42 got to a panzer brigade, He was asked to build software to help them r…
题目链接 描述 A supermarket has a set Prod of products on sale. It earns a profit px for each product x∈Prod sold by a deadline dx that is measured as an integral number of time units starting from the moment the sale begins. Each product takes precisely o…
A. Night at the Museum time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Grigoriy, like the hero of one famous comedy film, found a job as a night security guard at the museum. At first night…
题意: 村庄里有m个人,初始有一些人感染了病毒.如果第i个人的编号i满足,有一对(a,b)(a是初始病毒感染者编号,b为前一天的感染者编号)使\(a*b mod m =i\),则第i个人会感染病毒.每次感染症状只持续1天(但是可能在几天内会感染多次),问k天以后感染病毒的人的编号 \(m<=1500,k<=1e18\) 我们发现,题目中的"更新操作"满足结合律 于是写一个类似矩阵乘法的东西就行了 #include<bits/stdc++.h> using nam…
