foo.cc: In function 'int gy(int, int)':
foo.cc:5:6: warning: unused variable 'imin' [-Wunused-variable]
  int imin,imax;
      ^~~~
foo.cc:19:9: warning: 'imax' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return imax;
         ^~~~
foo.cc: In function 'int main()':
foo.cc:6:2: warning: 'imax' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(n1<n2){
  ^~
foo.cc:5:11: note: 'imax' was declared here
  int imin,imax;
           ^~~~

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