View Compilation Error

0_0_38510524_11694.cpp: In function 'int main()':
0_0_38510524_11694.cpp:8:12: error: 'cin' was not declared in this scope
     while (cin >> cnt[0] >> cnt[1] >> cnt[2] && (cnt[0] || cnt[1] || cnt[2])) {
            ^
0_0_38510524_11694.cpp:10:31: error: 'memset' was not declared in this scope
         memset(x, 0, sizeof(x));
                               ^
0_0_38510524_11694.cpp:20:35: error: 'memcpy' was not declared in this scope
             memcpy(x, y, sizeof(x));
                                   ^
0_0_38510524_11694.cpp:24:17: error: 'cout' was not declared in this scope
                 cout << i << endl;
                 ^
0_0_38510524_11694.cpp:24:30: error: 'endl' was not declared in this scope
                 cout << i << endl;
                              ^