/in/foo.cc: In function 'int main()':
/in/foo.cc:18:35: error: 'a' was not declared in this scope
   18 |         for(int i=0;i<n;i++) cin>>a[i];
      |                                   ^
/in/foo.cc:19:23: error: 'a' was not declared in this scope
   19 |         cout<<FindMax(a,n);
      |                       ^