LeetCode 987. Vertical Order Traversal of a Binary Tree in F#

URL https://leetcode.com/problems/vertical-order-traversal-of-a-binary-tree/ Code https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/problems/0987/main.fsx type Tree = | Leaf | Node of int * Tree * Tree let verticalTraversal ...