View Compilation Error

0_0_33821060_23218.cpp: In function 'int main()':
0_0_33821060_23218.cpp:11:2: error: incomplete type 'std::ios {aka std::basic_ios<char>}' used in nested name specifier
  ios::sync_with_stdio(false);
  ^
0_0_33821060_23218.cpp:12:2: error: 'cin' was not declared in this scope
  cin.tie(0), cout.tie(0);
  ^
0_0_33821060_23218.cpp:12:14: error: 'cout' was not declared in this scope
  cin.tie(0), cout.tie(0);
              ^