/in/foo.cc: In function 'int main()':
/in/foo.cc:54:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=1;i<=sum;i++)
  ^~~
/in/foo.cc:55:40: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   cout<<ans[i].x<<" "<<ans[i].y<<endl; return 0;
                                        ^~~~~~