4.5 Implement a function to check if a binary tree is a binary search tree.LeetCode上的原题，请...本文转自博客园Grandyang的博客，原文链接：验证二叉搜索树[CareerCup]4.5 Validate Binary Search Tree，如需转载请自行联系原博主。
4.3 Given a sorted(increasing order)array with unique integer elements,write an ...本文转自博客园Grandyang的博客，原文链接：创建最小二叉搜索树[CareerCup]4.3 Create Minimal Binary Search Tree，如需转载请自行联系原博主。
