View Compilation Error

0_0_21026509_23470.cpp: In function 'int main()':
0_0_21026509_23470.cpp:10:11: error: 'cin' was not declared in this scope
     while(cin >> n) {
           ^
0_0_21026509_23470.cpp:22:63: error: 'max' was not declared in this scope
                 save_pre = max(save_pre, mark[now_char_id] + 1);
                                                               ^
0_0_21026509_23470.cpp:29:44: error: 'max' was not declared in this scope
             ans = max(ans, i - save_pre + 1);
                                            ^
0_0_21026509_23470.cpp:33:9: error: 'cout' was not declared in this scope
         cout << ans << " " << ansl << " " << ansr << endl;
         ^
0_0_21026509_23470.cpp:33:54: error: 'endl' was not declared in this scope
         cout << ans << " " << ansl << " " << ansr << endl;
                                                      ^