It seems to me that it has to do with the ordering of the dimensions in terms of constants. Simply changing the definition from $$$vis[2][n]$$$ to $$$vis[n][2]$$$ resolved the issue

I tried resubmitting the same solution, replacing the array type from bool to int 251558731. Evidently, the type of the array does not seem to matter in this case. Later this contest I submitted 251491928, which also uses arrays of variable size, but doesn't get CE. Just curious what exactly causes the bug, because the compiler logs aren't very helpful

Is anybody aware of the reason 251440010 results in a compilation error?