/in/foo.cc: In function 'int main()':
/in/foo.cc:37:25: warning: 'end' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<start<<" "<<end<<" "<<ans;
                         ^~~
/in/foo.cc:37:15: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<start<<" "<<end<<" "<<ans;
               ^~~