/in/foo.cc:1:1: error: stray '##' in program
 ##include<iostream>
 ^~
/in/foo.cc:1:3: error: 'include' does not name a type
 ##include<iostream>
   ^~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:7:2: error: 'cin' was not declared in this scope
  cin>>n;
  ^~~
/in/foo.cc:15:3: error: 'cout' was not declared in this scope
   cout<<"Yes"<<endl;
   ^~~~
/in/foo.cc:15:16: error: 'endl' was not declared in this scope
   cout<<"Yes"<<endl;
                ^~~~
/in/foo.cc:17:3: error: 'cout' was not declared in this scope
   cout<<"No";
   ^~~~