OJ-Problems-Source/HDOJ/1625_autoAC.cpp

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C++
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#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
#define MAXN 55
int path[MAXN][MAXN];
int m,n;
void floyd(){
for(int k=0;k<=n;k++){
for(int i=0;i<=n;i++){
for(int j=0;j<=n;j++){
path[i][j]+=path[i][k]*path[k][j];
}
}
}
for(int i=0;i<=n;i++)if(path[i][i]){
path[i][i]=-1;
for(int j=0;j<=n;j++){
for(int k=0;k<=n;k++){
if(path[j][i]&&path[i][k]){
path[j][k]=-1;
}
}
}
}
}
int main(){
int u,v,t=0;
while(~scanf("%d",&m)){
memset(path,0,sizeof(path));
n=0;
for(int i=1;i<=m;i++){
scanf("%d%d",&u,&v);
path[u][v]=1;
n=max(n,max(u,v));
}
printf("matrix for city %d\n",t++);
floyd();
for(int i=0;i<=n;i++){
for(int j=0;j<n;j++){
printf(" %d",path[i][j]);
}
printf(" %d\n",path[i][n]);
}
}
return 0;
}