LeetCode 98. Validate Binary Search Tree - Interview Prep Ep 69

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LeetCode 98. Validate Binary Search Tree: https://leetcode.com/problems/validat...

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Solutions explained:
We'll use two variables: min and max to keep track of the lower and upper boundaries of the current subtree, check if each node of this subtree is within this min and max boundary, if so, return true, otherwise, false.

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