foo.cc: In function 'int main()':
foo.cc:18:11: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<m<<" "<<l;
           ^~~
foo.cc:18:14: warning: 'l' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<m<<" "<<l;
  ~~~~~~~~~~~~^~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。