LeetCode 1346. Check If N and Its Double Exist in F#

URL Check If N and Its Double Exist - LeetCode Code https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/challenge/202412/check_if_n_and_its_double_exist/main.fsx let checkIfExist (arr: int list) : bool = let h = arr ...