LeetCode 23. Merge k Sorted Lists in F#

URL https://leetcode.com/problems/merge-k-sorted-lists/ Code https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/problems/0023/main.fsx type LinkedList<'a when 'a: comparison> = | ListEnd | ListNode of 'a * LinkedList<'a> ...