/in/foo.cc: In function 'void prim()':
/in/foo.cc:35:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for (int j=1;j<=n;j++)
   ^~~
/in/foo.cc:41:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
     if (min==1000000000.0) break;
     ^~
/in/foo.cc:23:14: warning: variable 'dir' set but not used [-Wunused-but-set-variable]
  int f[1005],dir[1005],k;
              ^~~
/in/foo.cc:42:7: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
   f[k]=1;
   ~~~~^~