answer.code: In function ‘int main()’:
answer.code:9:5: error: ‘cin’ was not declared in this scope
    9 |     cin>>n;
      |     ^~~
answer.code:18:9: error: ‘puts’ was not declared in this scope
   18 |         puts("0");
      |         ^~~~
answer.code:34:5: error: ‘cout’ was not declared in this scope
   34 |     cout<<ans%m;
      |     ^~~~