View Compilation Error

0_0_36342020_8106.cpp: In function 'int main()':
0_0_36342020_8106.cpp:73:2: error: incomplete type 'std::ios {aka std::basic_ios<char>}' used in nested name specifier
  ios::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
  ^
0_0_36342020_8106.cpp:73:31: error: 'cin' was not declared in this scope
  ios::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
                               ^
0_0_36342020_8106.cpp:73:46: error: 'cout' was not declared in this scope
  ios::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
                                              ^