foo.cc: In function ‘int BGY(int, int)’:
foo.cc:29:1: warning: control reaches end of non-void function [-Wreturn-type]
   29 | }
      | ^
foo.cc: In function ‘int SGB(int, int)’:
foo.cc:54:1: warning: control reaches end of non-void function [-Wreturn-type]
   54 | }
      | ^