/in/foo.cc: In function 'int main()':
/in/foo.cc:23:45: warning: format '%lld' expects argument of type 'long long int*', but argument 2 has type '__gnu_cxx::__alloc_traits<std::allocator<int> >::value_type* {aka int*}' [-Wformat=]
  for (i = 0; i < n; i++) scanf("%lld", &v[i]);
                                             ^