View Compilation Error

0_0_35883017_9454.cpp: In function 'int main()':
0_0_35883017_9454.cpp:14:11: error: 'cin' was not declared in this scope
     int T;cin>>T;
           ^
0_0_35883017_9454.cpp:19:32: error: 'scanf' was not declared in this scope
         scanf("%d%d%d",&n,&x,&y);
                                ^
0_0_35883017_9454.cpp:22:9: error: 'cout' was not declared in this scope
         cout<<ans[y-x+1]<<'\n';
         ^