ocaml - Check element in a list -


i have example:

let l  = [0;1;2] let l1 = [0;2]

from list l check whether or not there element of l belong l1; if yes return list of pair, instance [(1,0); (1;2)]

for this, should iterate through each element in l. check if first element of l element of l1. if is, filter out elements equal. length of list of equal elements first character in tuple go return list.

let check_list l l1 =   let rec check l l1 combined =      match l     |[] -> combined     |(h::t) -> if (list.mem h l1)          check t l1 ((list.length(list.filter (fun x -> h=x) l1),h)::combined)             else check t l1 combined in check l l1 []

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