/in/foo.cc: In function 'int main()':
/in/foo.cc:26:54: warning: format '%d' expects argument of type 'int', but argument 5 has type 'long long int' [-Wformat=]
    printf("w(%lld, %lld, %lld) = %d\n",a,b,c,w(a,b,c));
                                              ~~~~~~~~^
/in/foo.cc: In function 'long long int w(long long int, long long int, long long int)':
/in/foo.cc:20:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^