/in/foo.cc:7:7: error: 'N' was not declared in this scope
 int s[N];
       ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:12:40: error: 's' was not declared in this scope
  for (int i = 1; i <= n; i ++ ) cin >> s[i];
                                        ^
/in/foo.cc:13:7: error: 's' was not declared in this scope
  sort(s + 1, s + n + 1);
       ^