View Compilation Error

0_0_23088813_16357.cpp: In function 'int main()':
0_0_23088813_16357.cpp:9:29: error: 'cin' was not declared in this scope
  for (int i = 0; i < n; i++)cin >> a[i];
                             ^
0_0_23088813_16357.cpp:10:19: error: 'cin' was not declared in this scope
  int score,cnt=0; cin >> score;
                   ^