[LeetCode] 270. Closest Binary Search Tree Value

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Problem

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.
Example:

Input: root = [4,2,5,1,3], target = 3.714286

    4
   / \
  2   5
 / \
1   3

Output: 4

Solution

class Solution {
    public int closestValue(TreeNode root, double target) {
        if (root == null) return -1;
        int res = root.val;
        while (root != null) {
            if (Math.abs(root.val-target) < Math.abs(res-target)) res = root.val;
            if (root.val > target) root = root.left;
            else root = root.right;
        }
        return res;
    }
}
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