View Compilation Error

0_0_36565388_13262.cpp: In function 'int main()':
0_0_36565388_13262.cpp:14:31: error: 'memset' was not declared in this scope
         memset(a, 0, sizeof(a));
                               ^
0_0_36565388_13262.cpp:17:13: error: 'cin' was not declared in this scope
             cin >> x;
             ^
0_0_36565388_13262.cpp:22:13: error: 'cin' was not declared in this scope
             cin >> x;
             ^
0_0_36565388_13262.cpp:26:9: error: 'cout' was not declared in this scope
         cout << cnt << endl;
         ^
0_0_36565388_13262.cpp:26:24: error: 'endl' was not declared in this scope
         cout << cnt << endl;
                        ^