/in/foo.cc: In function 'int main()':
/in/foo.cc:27:75: warning: format '%d' expects argument of type 'int*', but argument 4 has type 'long long int*' [-Wformat=]
  for(int i=1;i<=m;i++) scanf("%d%d%d",&edge[i].from,&edge[i].to,&edge[i].w);
                                                                           ^
/in/foo.cc:31:66: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
   if(find(edge[i].from)==find(edge[i].to)) {printf("%d",edge[i].w);return 0;}
                                                                  ^