/in/foo.cc: In function 'int main()':
/in/foo.cc:17:25: warning: unused variable 'maxj' [-Wunused-variable]
  int maxx=0,maxy=0,maxi,maxj;
                         ^~~~
/in/foo.cc:32:14: warning: 'maxi' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<maxi<<" "<<maxx<<" "<<maxy<<endl;
              ^~~