32 lines
777 B
C++
32 lines
777 B
C++
#include <iostream>
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#include <cstdio>
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#include <cstring>
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#define N 1002
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using namespace std;
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int n;
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double map[N][N];
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void floyd(){
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for(int k = 1;k<=n;k++)
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for(int i = 1;i<=n;i++)
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for(int j = 1;j<=n;j++)
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if(map[i][j] < map[i][k]*map[k][j])
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map[i][j] = map[i][k]*map[k][j];
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}
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int main(){
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int Q,a,b;
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while(~scanf("%d",&n)){
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memset(map,0,sizeof(map));
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for(int i = 1;i<=n;i++)
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for(int j = 1;j<=n;j++)
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scanf("%lf",&map[i][j]);
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scanf("%d",&Q);
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floyd();
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for(int i = 0;i<Q;i++){
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scanf("%d%d",&a,&b);
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if(!map[a][b]) printf("What a pity!\n");
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else printf("%.3f\n",map[a][b]);
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}
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}
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return 0;
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}
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