View Compilation Error

0_0_27182630_217.cpp: In function 'int main()':
0_0_27182630_217.cpp:14:5: error: incomplete type 'std::ios {aka std::basic_ios<char>}' used in nested name specifier
     std::ios::sync_with_stdio(false);
     ^
0_0_27182630_217.cpp:19:9: error: 'cin' was not declared in this scope
         cin >> n;
         ^
0_0_27182630_217.cpp:37:13: error: 'cout' was not declared in this scope
             cout << "No" << endl;
             ^
0_0_27182630_217.cpp:37:29: error: 'endl' was not declared in this scope
             cout << "No" << endl;
                             ^
0_0_27182630_217.cpp:41:13: error: 'cout' was not declared in this scope
             cout << arr[0] << endl;
             ^
0_0_27182630_217.cpp:41:31: error: 'endl' was not declared in this scope
             cout << arr[0] << endl;
                               ^
0_0_27182630_217.cpp:45:13: error: 'cout' was not declared in this scope
             cout<<arr[0]<<endl;
             ^
0_0_27182630_217.cpp:45:27: error: 'endl' was not declared in this scope
             cout<<arr[0]<<endl;
                           ^