foo.cc:1:1: error: stray '##' in program
 ##include <iostream>
 ^~
foo.cc:1:3: error: 'include' does not name a type; did you mean '__has_include'?
 ##include <iostream>
   ^~~~~~~
   __has_include
foo.cc: In function 'int main()':
foo.cc:8:2: error: 'cin' was not declared in this scope
  cin>>h;
  ^~~
foo.cc:8:2: note: suggested alternative: 'main'
  cin>>h;
  ^~~
  main
foo.cc:29:2: error: 'cout' was not declared in this scope
  cout<<j;
  ^~~~

[Hydro](https://hydro.ac)提供评测服务