View Compilation Error

0_0_21114934_16919.cpp: In function 'int main()':
0_0_21114934_16919.cpp:5:19: error: 'scanf' was not declared in this scope
     scanf("%d", &T);
                   ^
0_0_21114934_16919.cpp:15:17: error: 'printf' was not declared in this scope
   printf("YES\n");
                 ^
0_0_21114934_16919.cpp:29:27: error: 'printf' was not declared in this scope
             printf("YES\n");
                           ^
0_0_21114934_16919.cpp:31:26: error: 'printf' was not declared in this scope
             printf("NO\n");
                          ^