zoj-1789

来源：互联网发布：如何修改电脑mac地址编辑：程序博客网时间：2024/06/05 22:54

题目链接：http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=1789

题意：查找与0有关的人即为SARS 并查集

#include<stdio.h>#include<string.h>#include<algorithm>using namespace std;int father[30005];int rank[30005] ;int n,m;void init(){    for(int i = 0 ; i < n ;i ++ )    {        father[i] = i;        rank[i] = 1; //自身节点为1    }}int find(int x){    if(x != father[x]) return find(father[x]);     return father[x] ;}void Union(int x,int y){    int xx = find(x);    int yy = find(y);    if(xx == yy) return ;    father[xx] = yy;    rank[yy] += rank[xx] ; //记录共同祖先的有多少个成员}int main(){    int a,b,k;    while(scanf("%d%d",&n,&m),n+m)    {        init();        for(int i = 0; i < m ; i++)        {            scanf("%d%d",&k,&a);            for(int j = 1 ; j < k ;j ++)            {                scanf("%d",&b);                Union(a,b);                a = b ;            }        }        printf("%d\n",rank[find(0)]);//查找0的祖先    }}

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