Conscription Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 14661   Accepted: 5102 Description Windy has a country, and he wants to build an army to protect his country. He has picked up N girls and M boys and wants to collect them to b…

[题目链接] http://poj.org/problem?id=3723 [题目大意] 招募名单上有n个男生和m个女生,招募价格均为10000, 但是某些男女之间存在好感,则招募的时候, 可以降低与已招募人员中最大好感度的值, 求一定招募顺序使得招募总价格最小,输出最小价格 [题解] 对于存在好感度的男女之间连边,那么答案就是总价格减去最大权森林 [代码] #include <cstdio> #include <algorithm> using namespace std; in…

Description Severe acute respiratory syndrome (SARS), an atypical pneumonia of unknown aetiology, was recognized as a global threat in mid-March 2003. To minimize transmission to others, the best strategy is to separate the suspects from others. In t…

开始了最小生成树,以简单应用为例hoj1323,1232(求连通分支数,直接并查集即可) prim(n*n) 一般用于稠密图,而Kruskal(m*log(m))用于系稀疏图 #include<iostream> //prim n^2 #include<cstdio> #include<cstring> using namespace std; const int inf=0x3f3f3f3f; int a[102][102];int dis[102];int mark…

D. Dividing Kingdom II   Long time ago, there was a great kingdom and it was being ruled by The Great Arya and Pari The Great. These two had some problems about the numbers they like, so they decided to divide the great kingdom between themselves. Th…

C. Edgy Trees time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a tree (a connected undirected graph without cycles) of nn vertices. Each of the n−1n−1 edges of the tree is col…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=3018 题目大意:有n个点,m条边,人们希望走完所有的路,且每条道路只能走一遍.至少要将人们分成几组. 解题思路:先用并查集求出所有的连通块,然后判断每个连通块内点的度数,如果有奇数点则需要的组数ans+=奇数点/2:反之,所需组数ans+=1.注意:如果遇到孤立点即度数为0的点则不用算进去,因为没有跟他相连的边. 代码: #include<iostream> #include<cstdio&…

描述 You have n computers numbered from 1 to n and you want to connect them to make a small local area network (LAN). All connections are two-way (that is connecting computers i and j is the same as connecting computers j and i). The cost of connecting…

题意:给出n个点的坐标,要把n个点连通,使得总距离最小,可是有m对点已经连接,输入m,和m组a和b,表示a和b两点已经连接. 思路:两种做法.(1)用prim算法时,输入a,b.令mp[a][b]=0.然后进行一遍prim(2)Kruskal算法+并查集 代码: //prim写法 #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <…

Constructing Roads Time Limit: 2000MS   Memory Limit: 65536K               Description There are N villages, which are numbered from 1 to N, and you should build some roads such that every two villages can connect to each other. We say two village A…