poj1251最小生成树

#include <cstdio>
#include <cstring>
#include <algorithm>
#include <climits>
#include <string>
#include <iostream>
#include <map>
#include <cstdlib>
#include <list>
#include <set>
#include <queue>
#include <stack>

using namespace std;
int father[22222];
int getfather(int x)
{
    if(x!=father[x]) father[x]=getfather(father[x]);
        return father[x];
}

struct Node
{
    int a;int b;int val;
}node[111111];
int cmp(const Node &a,const Node &b)
{
    return a.val<b.val;
}
int main()
{
    int n,m;
    while(cin>>n,n){
        int ans=0;
        int sum=0;
        for(int i=0;i<n;i++) father[i]=i;
        for(int i=0;i<n-1;i++){
            char c;cin>>c;int a=c-'A';
            cin>>m;
            for(int j=0;j<m;j++){
                int val;
                char d;cin>>d>>val;int b;;
                b=d-'A';
                node[ans].a=a;node[ans].b=b;node[ans].val=val;ans++; //cout<<a<<" "<<b<<endl;
            }
        }
        sort(node,node+ans,cmp);
      //  cout<<endl;
       // for(int i=0;i<ans;i++)
         //   printf("%d %d %d\n",node[i].a,node[i].b,node[i].val);system("pause");
        for(int i=0;i<ans;i++){
            int fa=getfather(node[i].a);int fb=getfather(node[i].b);
            if(fa!=fb){
                sum+=node[i].val;father[fa]=fb;
            }
        }
        cout<<sum<<endl;
    }
    return 0;
}