/in/foo.cc: In function 'int main()':
/in/foo.cc:16:20: warning: format '%lld' expects argument of type 'long long int*', but argument 2 has type 'long long int' [-Wformat=]
     scanf("%lld", n);
                    ^
/in/foo.cc:19:40: warning: format '%lld' expects argument of type 'long long int*', but argument 2 has type 'long long int' [-Wformat=]
         scanf("%lld %lld %lld", a, b, c);
                                        ^
/in/foo.cc:19:40: warning: format '%lld' expects argument of type 'long long int*', but argument 3 has type 'long long int' [-Wformat=]
/in/foo.cc:19:40: warning: format '%lld' expects argument of type 'long long int*', but argument 4 has type 'long long int' [-Wformat=]
/in/foo.cc:19:41: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
         scanf("%lld %lld %lld", a, b, c);
                                         ^
/in/foo.cc:19:41: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
/in/foo.cc:19:41: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]