View Compilation Error

0_0_25880219_11142.cpp: In function 'int main()':
0_0_25880219_11142.cpp:5:16: error: 'scanf' was not declared in this scope
  scanf("%d", &n);
                ^
0_0_25880219_11142.cpp:16:18: error: 'printf' was not declared in this scope
    printf("YES\n");
                  ^
0_0_25880219_11142.cpp:18:17: error: 'printf' was not declared in this scope
    printf("NO\n");
                 ^