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0_0_39393315_18878.cpp: In function 'int main()':
0_0_39393315_18878.cpp:17:9: error: 'cin' was not declared in this scope
   17 |         cin>>n;
      |         ^~~
0_0_39393315_18878.cpp:1:1: note: 'std::cin' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
  +++ |+#include <iostream>
    1 | 
0_0_39393315_18878.cpp:26:17: error: 'cout' was not declared in this scope
   26 |                 cout<<ans<<endl;
      |                 ^~~~
0_0_39393315_18878.cpp:26:17: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
0_0_39393315_18878.cpp:26:28: error: 'endl' was not declared in this scope
   26 |                 cout<<ans<<endl;
      |                            ^~~~
0_0_39393315_18878.cpp:1:1: note: 'std::endl' is defined in header '<ostream>'; did you forget to '#include <ostream>'?
  +++ |+#include <ostream>
    1 |