F. Asya And Kittens time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Asya loves animals very much. Recently, she purchased nn kittens, enumerated them from 11 and nn and then put them into…

F. Asya And Kittens Asya loves animals very much. Recently, she purchased nn kittens, enumerated them from 11 and nn and then put them into the cage. The cage consists of one row of nn cells, enumerated with integers from 11 to nn from left to right.…

reference :https://www.cnblogs.com/ZERO-/p/10426473.html…

Problem   Codeforces #541 (Div2) - F. Asya And Kittens Time Limit: 2000 mSec Problem Description Input The first line contains a single integer nn (2≤n≤150000) — the number of kittens. Each of the following n−1lines contains integers xi and yi (1≤xi,…

题面: 传送门 题目描述: Asya把N只(从1-N编号)放到笼子里面,笼子是由一行N个隔间组成.两个相邻的隔间有一个隔板. Asya每天观察到有一对想一起玩,然后就会把相邻的隔间中的隔板取出来,使两个相邻的隔间合并为一个隔间. 过了N-1天后,所有隔板将被取出,然后所有的隔间合并成一个隔间. 现在Asya记得每天想一起玩的的编号,要求:在最开始(笼子的所有隔板未取出前)隔间的位置.如果有多种可能,输出其中一种. 题目分析: 这道题是一道典型的并查集,我们还是先分析一下样例. 首先,1和4想一起…

题目链接: 题目 F. Polycarp and Hay time limit per test: 4 seconds memory limit per test: 512 megabytes input: standard input output: standard output 问题描述 The farmer Polycarp has a warehouse with hay, which can be represented as an n × m rectangular table,…

F. Polycarp and Hay 题目连接: http://www.codeforces.com/contest/659/problem/F Description The farmer Polycarp has a warehouse with hay, which can be represented as an n × m rectangular table, where n is the number of rows, and m is the number of columns…

题面 传送门 思路 真是一道神奇的题目呢 题目本身可以转化为二分图匹配问题,要求右半部分选择的点的最大编号最小的一组完美匹配 注意到这里左边半部分有一个性质:每个点恰好连出两条边到右半部分 那么我们可以利用这个性质 考虑一个左边的点和它右边联通的两个点,发现这两个点只能选择一个和这个左边的点匹配 那么我们考虑把这个点点匹配的模型转化成点边匹配 我们在同一个左边点连的两个右边点之间连边,那么问题就变成了一个点和一条相邻的边匹配,求完美匹配的问题了 而这个问题,我们显然可以用并查集来很好的解决 考虑…

题目链接: F. Polycarp and Hay time limit per test 4 seconds memory limit per test 512 megabytes input standard input output standard output The farmer Polycarp has a warehouse with hay, which can be represented as an n × m rectangular table, where n is t…

Problem 1542 - F - Countries Time Limit: 1000MS Memory Limit: 65536KB Total Submit: 266 Accepted: 36 Special Judge: No Description There are n countries at planet X on which Xiao Ming was born. Some countries, which have been sharing fine bilateral r…