View Compilation Error

0_0_35677587_2545.cpp: In function 'int main()':
0_0_35677587_2545.cpp:10:2: error: 'cin' was not declared in this scope
  cin >> t;
  ^
0_0_35677587_2545.cpp:14:3: error: 'cout' was not declared in this scope
   cout << a[n] << endl;
   ^
0_0_35677587_2545.cpp:14:19: error: 'endl' was not declared in this scope
   cout << a[n] << endl;
                   ^