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我为啥用Prim不能AC如题,总说WA。 牛人帮我看下把 #include<iostream> using namespace std; int main() { int n,m; while(cin>>n>>m) { int i,j,k=0,u,v; long l,max,min; long **a=new long *[m]; for(i=0;i<m;i++) a[i]=new long [3]; long **b=new long *[n+1]; for(i=0;i<n+1;i++) b[i]=new long [n+1]; for(i=1;i<n+1;i++) for(j=1;j<n+1;j++) b[i][j]=0; for(i=0;i<m;i++) { cin>>u>>v>>l; b[u][v]=b[v][u]=l; } for(i=1;i<n+1;i++) for(j=1;j<n+1;j++) if(b[i][j]==0) b[i][j]=2147483647; bool *s=new bool [n+1]; long *lowcost=new long [n+1]; int *closest=new int [n+1]; s[1]=true; for(i=2;i<=n;i++){ lowcost[i]=b[1][i]; closest[i]=1; s[i]=false; } for(i=1;i<n;i++){ min=2147483647; j=1; for(k=2;k<=n;k++) if((lowcost[k]<min)&&(!s[k])){ min=lowcost[k]; j=k; } s[j]=true; for(k=2;k<=n;k++) if((b[j][k]<lowcost[k])&&(!s[k])){ lowcost[k]=b[j][k]; closest[k]=j; } } max=0; for(i=2;i<=n;i++) if(s[i]==true&&lowcost[i]>max) max=lowcost[i]; cout<<max<<endl; } return 0; } Followed by:
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