C. Useful Decomposition time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Ramesses knows a lot about problems involving trees (undirected connected graphs without cycles)! He created a new us…

Codeforces 981 D.Bookshelves 题目大意: 给n个数,将这n个数分为k段,(n,k<=50)分别对每一段求和,再将每个求和的结果做与运算(&).求最终结果的最大值. 思路: 将答案ans二进制表示,按位枚举,从最高位i开始,检查ans|(1<<i)是否能够得到,如果能,则ans|=1<<i,向低位继续枚举:不能,就直接继续向低位枚举. 检查 ans|(1<<i)能否得到:每次用DP的方式寻找,dp[i][j]表示将前i个数分为j段…

E - Addition on Segments 思路: dp dp[i]表示构成i的区间的右端点 先将询问按r排序 然后,对于每次询问,每次枚举 i 从 n-x 到 1,如果dp[i] >= l , 那么 dp[i+x] = max(dp[i+x], dp[j]) #include<bits/stdc++.h> using namespace std; #define fi first #define se second #define pi acos(-1.0) #define LL…

A /*Huyyt*/ #include<bits/stdc++.h> #define mem(a,b) memset(a,b,sizeof(a)) #define pb push_back using namespace std; typedef long long ll; typedef unsigned long long ull; ][] = {{, }, {, }, {, -}, { -, }, {, }, {, -}, { -, -}, { -, }}; ; + + + + 1e9…

李煜东dalao今天给我们讲课了QwQ ppt上一道题 英文题说一下题意吧,以后又看不懂了 将一棵树分割成多个简单路径,每个边只能在一条路径上,但至少有一个公共节点. 输出简单路径分割方法/No 由题易知,如果图不是一个菊花图的话,想搞成题意的样子至少要有环或者有的路径共用. 想到这儿代码搞一搞就行了 #include <iostream> #include <cstdio> #include <cstring> #include <vector> usin…

Codeforces Avito Code Challenge 2018 D. Bookshelves 题目连接: http://codeforces.com/contest/981/problem/D Description Mr Keks is a typical white-collar in Byteland. He has a bookshelf in his office with some books on it, each book has an integer positive…

题目链接:http://codeforces.com/contest/981/problem/D 题目大意:给你n本书以及每本书的价值,现在让你把n本书放到k个书架上(只有连续的几本书可以放到一个书架上),每个书架的价值值是书架上每本书的价值和,总的价值每个书架权值按位与的结果,要求输出最大的总价值.解题思路:按位从高到低枚举,每次都判断一下是否符合条件(即判断ans|(1<<i)是否能够取到),如果符合则更新答案.判断过程:设dp[i][j]表示将1~i分为j段是否符合条件,然后枚举区间,状…

上一次我们拿学校的URP做了个小小的demo.... 其实我们还可以把每个学生的证件照爬下来做成一个证件照校花校草评比 另外也可以写一个物理实验自动选课... 但是出于多种原因,,还是绕开这些敏感话题.. 今天,我们来扒一下cf的题面! PS:本代码不是我原创 1. 必要的分析 1.1 页面的获取 一般情况CF的每一个 contest 是这样的: 对应的URL是:http://codeforces.com/contest/xxx 还有一个Complete problemset页面,它是这样的:…

http://codeforces.com/contest/738/problem/D Galya is playing one-dimensional Sea Battle on a 1 × n grid. In this game a ships are placed on the grid. Each of the ships consists of bconsecutive cells. No cell can be part of two ships, however, the shi…

http://codeforces.com/contest/738/problem/C Vasya is currently at a car rental service, and he wants to reach cinema. The film he has bought a ticket for starts in t minutes. There is a straight road of length s from the service to the cinema. Let's…