/in/foo.cc:1:1: error: stray '##' in program
 ##include<bits/stdc++.h>
 ^~
/in/foo.cc:1:3: error: 'include' does not name a type
 ##include<bits/stdc++.h>
   ^~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:6:2: error: 'cin' was not declared in this scope
  cin>>a>>b>>c;
  ^~~
/in/foo.cc:7:2: error: 'cout' was not declared in this scope
  cout<<b;
  ^~~~