View Compilation Error

0_0_31933764_26401.cpp: In function 'int main()':
0_0_31933764_26401.cpp:10:23: error: 'scanf' was not declared in this scope
     for(scanf("%d", &T); T--; )
                       ^
0_0_31933764_26401.cpp:39:27: error: 'printf' was not declared in this scope
         printf("%d\n", ans);
                           ^