题目链接:http://codeforces.com/contest/766/problem/D 题意:给你n个单词,m个关系(两个单词是反义词还是同义词),然后问你所给的关系里面有没有错的,最后再给你q个询问,问你两个单词之间的关系是什么, 同义词输出1,反义词输出2,不确定输出3; 其实就是种类并查集.种类并查集怎么做之前的随笔中有说过. #include <iostream> #include <cstring> #include <map> using name…

D. Mahmoud and a Dictionary time limit per test:4 seconds memory limit per test:256 megabytes input:standard input output: standard output Mahmoud wants to write a new dictionary that contains n words and relations between them. There are two types o…

D. Mahmoud and a Dictionary 题目连接: http://codeforces.com/contest/766/problem/D Description Mahmoud wants to write a new dictionary that contains n words and relations between them. There are two types of relations: synonymy (i. e. the two words mean t…

题意:给出n个单词,m条关系,q个询问,每个对应关系有,a和b是同义词,a和b是反义词,如果对应关系无法成立就输出no,并且忽视这个关系,如果可以成立则加入这个约束,并且输出yes.每次询问两个单词的关系,1,同义词,2,反义词,3,不确定 题解:这题思路比较奇特,开辟2*n的并查集的空间,第i+n代表i的反义词所在的树,初始为i+n,也就是说i+n代表i的反义词 #include<bits/stdc++.h> using namespace std; #define ll long long…

题目链接:https://cn.vjudge.net/problem/CodeForces-766D 题意 写词典,有些词是同义词,有些是反义词,还有没关系的词 首先输入两个词,需要判断是同义还是是反义,若没关系就按操作归为同义或反义 思路 经典并查集的动物园问题 维护两个并查集,find(a)表示a的同类代表元,find(a+maxn)表示异类代表元 find(a)==find(b) && find(a+maxn)==find(b+maxn) 就是说ab同类 find(a+maxn)==…

Codeforces Round #582 (Div. 3)-G. Path Queries-并查集 [Problem Description] 给你一棵树,求有多少条简单路径\((u,v)\),满足\(u\)到\(v\)这条路径上的最大值不超过\(k\).\(q\)次查询. [Solution] 并查集 将所有边按权值从小到大排序,查询值\(k_i\)也从小到大排序.对于每次查询的值\(k_i\),将边权小于等于\(k_i\)的边通过并查集合并在一起.对于合并后的联通块,每个联通块对答案的贡献…

time limit per test4 seconds memory limit per test256 megabytes inputstandard input outputstandard output Mahmoud wants to write a new dictionary that contains n words and relations between them. There are two types of relations: synonymy (i. e. the…

E. Bindian Signalizing Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/problemset/problem/5/E Description Everyone knows that long ago on the territory of present-day Berland there lived Bindian tribes. Their capital was surrounded…

C. Civilization Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/455/problem/C Description Andrew plays a game called "Civilization". Dima helps him. The game has n cities and m bidirectional roads. The cities are numbe…

题目链接:http://codeforces.com/problemset/problem/691/D 给你n个数,各不相同,范围是1到n.然后是m行数a和b,表示下标为a的数和下标为b的数可以交换无数次.问你最后字典序最大的数列是什么. 将下面的a和b用并查集联系起来存到祖节点对应的数组中,然后从大到小排序数组,最后依次按照父节点的数组中的顺序输出. 也可以用dfs的方法解(略麻烦),形成一个环路的就在一个数组中... //并查集 #include <bits/stdc++.h> using…