/in/foo.cc: In function 'int main()':
/in/foo.cc:17:28: warning: format '%lld' expects argument of type 'long long int*', but argument 2 has type 'int*' [-Wformat=]
     scanf("%lld %lld",&n,&m);
                            ^
/in/foo.cc:17:28: warning: format '%lld' expects argument of type 'long long int*', but argument 3 has type 'int*' [-Wformat=]
/in/foo.cc:47:22: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'int' [-Wformat=]
     printf("%lld",ans);
                      ^