foo.cc: In function ‘int maxy(int, int)’:
foo.cc:17:16: warning: ‘maxy’ may be used uninitialized [-Wmaybe-uninitialized]
   17 |         return maxy;
      |                ^~~~
foo.cc:7:18: note: ‘maxy’ was declared here
    7 |         int max, maxy;
      |                  ^~~~
foo.cc: In function ‘int main()’:
foo.cc:45:12: warning: ‘maxy’ may be used uninitialized [-Wmaybe-uninitialized]
   45 |         b0 = b0 / gys;
      |         ~~~^~~~~~~~~~
foo.cc:7:18: note: ‘maxy’ was declared here
    7 |         int max, maxy;
      |                  ^~~~