POJ 1125

#include<iostream>
#include<stdio.h>
#define MAXN 102
#define inf 100000000
using namespace std;
int _m[MAXN][MAXN];
int min1[MAXN][MAXN];
int pre1[MAXN][MAXN];
typedef int elem_t;
void floyd_warshall(int n,elem_t mat[][MAXN],elem_t  min[][MAXN],int pre[][MAXN]);
int main()
{
    //freopen("acm.acm","r",stdin);
    int num;
    int i;
    int j;
    int k;
    int n;
    int bod;
    int time;
    int max;
    int min;
    while(cin>>num)
    {
        if(num == 0)
            break;
        for(i = 0; i < num; ++ i)
            for(j = 0; j < num; ++ j)
            {
                _m[i][j] = inf;
                if(i == j)
                    _m[i][j] = 0;
            }
            
        for(i = 0; i < num; ++ i)
        {
            cin>>k;
            for(j = 0; j < k; ++ j)
            {
                cin>>n>>time;
                _m[i][n-1] = time;
            }
        }
        floyd_warshall(num,_m,min1,pre1);
        min = inf;
        for(i = 0; i < num; ++ i)
        {
            max = 0;
            for(j = 0; j < num; ++j)
            {
                if(min1[i][j] > max)
                {
                    max = min1[i][j];
                }
            }
            if(max < min)
            {
                min = max;
                bod = i + 1;
            }
        }
        cout<<bod <<" "<<min<<endl;
    }
}


void floyd_warshall(int n,elem_t mat[][MAXN],elem_t  min[][MAXN],int pre[][MAXN]){
    int i,j,k;
    for (i=0;i<n;i++)
        for (j=0;j<n;j++)
            min[i][j]=mat[i][j],pre[i][j]=(i==j)?-1:i;
    for (k=0;k<n;k++)
        for (i=0;i<n;i++)
            for (j=0;j<n;j++)
                if (min[i][k]+min[k][j]<min[i][j])
                    min[i][j]=min[i][k]+min[k][j],pre[i][j]=pre[k][j];
}

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