LeetCode 114. Flatten Binary Tree to Linked List in F#

URL https://leetcode.com/problems/flatten-binary-tree-to-linked-list/ Code https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/problems/0114/main.fsx type Tree = | Leaf | Node of int * Tree * Tree let flatten (root: Tree) : Tr...