HDOJ 1596

9899828

2013-12-27 16:42:37

Accepted

1596

3312MS

6668K

711 B

C++

泽泽

 floyed暴力

#include<cstdio>
#include<cstring>
double g[1001][1001];
void floyed(int n)
{
    int k,j,i;
    for(k=1;k<=n;k++)
    {
        for(i=1;i<=n;i++)
        {
            if(g[i][k]!=0)
            {
                for(j=1;j<=n;j++)
                {
                    if(g[i][k]*g[k][j]>g[i][j])
                        g[i][j]=g[j][i]=g[i][k]*g[k][j];
                }
            }
        }
    }
    
}
int main()
{
    double a,unsafe;
    int n,i,j,m;
    while(scanf("%d",&n)!=EOF)
    {
        for(i=1;i<=n;i++)
        {
            for(j=1;j<=n;j++)
            {
                scanf("%lf",&unsafe);
                g[i][j]=unsafe;
            }
        }
        floyed(n);
        int a,b;
        scanf("%d",&m);        
        for(i=1;i<=m;i++)
        {
            scanf("%d %d",&a,&b);
            if(g[a][b]==0)
                printf("What a pity!
");
            else
              printf("%.3lf
",g[a][b]);
        }
    }
    return 0;
}