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(* Split a list at a given index [i] (the first list contains all the elements
up to element of index [i], not included, the second one contains the remaining
elements. Note that the first returned list has length [i].
*)
let rec list_split_at (ls : 'a list) (i : int) =
if i < 0 then raise (Invalid_argument "list_split_at take positive integers")
else if i = 0 then ([], ls)
else
match ls with
| [] ->
raise
(Failure
"The int given to list_split_at should be <= the list's length")
| x :: ls' ->
let ls1, ls2 = list_split_at ls' (i - 1) in
(x :: ls1, ls2)
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