/in/foo.cc:1:1: error: stray '##' in program
    1 | ##include<bits/stdc++.h>
      | ^~
/in/foo.cc:1:3: error: 'include' does not name a type
    1 | ##include<bits/stdc++.h>
      |   ^~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:7:9: error: 'cout' was not declared in this scope
    7 |         cout<<sizeof(a)<<" ";
      |         ^~~~