/in/foo.cc: In function 'void prim()':
/in/foo.cc:40:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(int i=head[1];i;i=eg[i].next)
     ^~~
/in/foo.cc:42:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
         for(int i=1;i<n;i++)
         ^~~