/in/foo.cc: In function 'int main()':
/in/foo.cc:17:48: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
  for (int i = 1; i <= n; i++) scanf("%d", &S[i]);
                                                ^
/in/foo.cc:29:20: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
  printf("%d\n", ans);
                    ^