View Compilation Error

0_0_21328223_30291.cpp: In function 'int main()':
0_0_21328223_30291.cpp:45:17: error: 'scanf' was not declared in this scope
  scanf("%lld",&T);
                 ^
0_0_21328223_30291.cpp:54:24: error: 'printf' was not declared in this scope
   printf("%lld\n",CRT());
                        ^