foo.cc: In function ‘int BGY(int, int)’:
foo.cc:31:1: warning: control reaches end of non-void function [-Wreturn-type]
   31 | }
      | ^
foo.cc: In function ‘int SGB(int, int)’:
foo.cc:56:1: warning: control reaches end of non-void function [-Wreturn-type]
   56 | }
      | ^