Leetcode 270Closest Binary Search Tree Value
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Given a non-empty binary search tree and a target value, find the value in the BST that is closest to the target.
Note: Given target value is a floating point. You are guaranteed to have only one unique value in the BST that is closest to the target.
Analysis:
这个题可以用二叉树的性质，每次排除掉树的一半节点，然后判断是children的小还是当前节点小。
Leetcode中BFS的性质
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