View Compilation Error

0_0_39084783_2752.cpp: In function 'int main()':
0_0_39084783_2752.cpp:27:13: error: 'cin' was not declared in this scope
   27 |             cin >> b >> V;
      |             ^~~
0_0_39084783_2752.cpp:4:1: note: 'std::cin' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
    3 | #include<cstring>
  +++ |+#include <iostream>
    4 | #define int long long
0_0_39084783_2752.cpp:45:5: error: 'cout' was not declared in this scope
   45 |     cout << f[n][m] << '\n';
      |     ^~~~
0_0_39084783_2752.cpp:45:5: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?