Given a binary tree, determine if it is a valid binary search tree (BST).

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本文介绍了一种验证二叉树是否为二叉搜索树的方法。通过中序遍历将节点值存储到数组中，检查数组是否递增，以此判断二叉树是否满足二叉搜索树的性质。

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思路：定义一个数组，按照中序输出的方式将值放入数组中，然后遍历比较，满足从小到大排列，则满足二叉搜索树。

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