/in/foo.cc: In function 'int main()':
/in/foo.cc:240:7: warning: unused variable 'crd' [-Wunused-variable]
  char crd;
       ^~~
/in/foo.cc: In function 'int jud(int, int)':
/in/foo.cc:141:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^