Leetcode 530. Minimum Absolute Difference in BST
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Given a binary search tree with non-negative values, find the minimum absolute difference between values of any two nodes.
Example:
Input: 1 3 / 2 Output: 1 Explanation: The minimum absolute difference is 1, which is the difference between 2 and 1 (or between 2 and 3).
Note: There are at least two nodes in this BST.
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思路:迭代后序遍历平衡二叉树,得到左子树的最小绝对值差lmin和左子树最大值maxl,得到右子树的最小绝对值差rmin和右子树最小值minr,然后返回min(lmin,rmin,root.val-maxl,root.val-minr)。
代码:
1 /** 2 * Definition for a binary tree node. 3 * public class TreeNode { 4 * int val; 5 * TreeNode left; 6 * TreeNode right; 7 * TreeNode(int x) { val = x; } 8 * } 9 */ 10 public class Solution { 11 TreeSet<Integer> ts = new TreeSet(); 12 public int getMinimumDifference(TreeNode root) { 13 if (root == null) 14 return Integer.MAX_VALUE; 15 int lmin = getMinimumDifference(root.left); 16 if (ts.floor(root.val) != null) { 17 lmin = Math.min(root.val - ts.floor(root.val), lmin); 18 } 19 int rmin = getMinimumDifference(root.right); 20 if (ts.ceiling(root.val) != null) { 21 rmin = Math.min(ts.ceiling(root.val) - root.val, rmin); 22 } 23 ts.add(root.val); 24 return Math.min(lmin, rmin); 25 } 26 }
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