mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
62 lines
2.1 KiB
C++
62 lines
2.1 KiB
C++
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#include<cstdio>
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#include<cstring>
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#include<iostream>
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#include<algorithm>
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using namespace std;
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const int N = 101;
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const double INF = 10000000000.0;
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const int INF_INT =10000000;
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int side[N][N];
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int dis[N][N];
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int vis[N][N];
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int tmp[N][N];
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double ans[N][N];
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int main(){
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int n,m;
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while(~scanf("%d%d",&n,&m)){
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memset(vis,-1,sizeof(vis));
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for(int i=1;i<=n;i++)for(int j=1;j<=n;j++){ans[i][j]=INF;side[i][j]=INF_INT;}
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for(int i=0;i<m;i++){
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int u,v,w;
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scanf("%d%d%d",&u,&v,&w);
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side[u][v]=w;
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vis[u][v]=1;
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}
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for(int k=1;k<=n;k++)for(int i=1;i<=n;i++)if(vis[i][k]!=-1){
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for(int j=1;j<=n;j++)if(vis[k][j]!=-1){
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if(vis[i][j]==-1)vis[i][j]=vis[i][k]+vis[k][j];
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else vis[i][j]=min(vis[i][j],vis[i][k]+vis[k][j]);
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}
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}
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for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)dis[i][j]=side[i][j];
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for(int k=1;k<=n;k++){
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for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)if(vis[i][j]!=-1&&k>=vis[i][j]){
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ans[i][j]=min(ans[i][j],(double)dis[i][j]/k);
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}
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for(int i=1;i<=n;i++)for(int j=1;j<=n;j++){tmp[i][j]=dis[i][j];dis[i][j]=INF_INT;}
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for(int i=1;i<=n;i++)for(int j=1;j<=n;j++){
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for(int h=1;h<=n;h++){
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if(vis[i][h]==-1||k<vis[i][h])continue;
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if(vis[h][j]==-1||k<vis[h][j])continue;
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dis[i][j]=min(dis[i][j],tmp[i][h]+side[h][j]);
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}
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}
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}
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for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)if(vis[i][j]!=-1){
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for(int k=1;k<=n;k++)if(vis[i][k]!=-1&&vis[k][j]!=-1&&vis[k][k]!=-1){
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ans[i][j]=min(ans[i][j],ans[k][k]);
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}
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}
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for(int i=1;i<=n;i++){
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int j=1;
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if(vis[i][j]==-1)printf("NO");
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else printf("%.3lf",ans[i][j]);
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for(j=2;j<=n;j++){
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if(vis[i][j]==-1)printf(" NO");
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else printf(" %.3lf",ans[i][j]);
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}
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printf("\n");
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}
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}
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}
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