View Compilation Error

0_0_34693683_24654.cpp: In function 'int main()':
0_0_34693683_24654.cpp:103:19: error: 'scanf' was not declared in this scope
     scanf("%d", &T);
                   ^
0_0_34693683_24654.cpp:117:28: error: 'printf' was not declared in this scope
         printf("%d\n", -ans);
                            ^