Teaching Kids Programming – Verify Preorder Sequence in Binary Search Tree (Monotonous Stack)

A stack-based solution for LeetCode 255, Verify Preorder Sequence in Binary Search Tree. The key idea is to track a lower bound: once preorder traversal enters the right subtree of a node, all later values must be greater than that node. LeetCode 255: Verify Preorder Sequence in Binary Search Tree LeetCode 255 asks whether a given array of unique integers can be the preorder traversal of a Binary…