劍指offer刷題--GZ18--二叉樹的鏡像

解題思路：交換左右子樹的節點，而後遞歸調用該方法。java /** public class TreeNode { int val = 0; TreeNode left = null; TreeNode right = null; public TreeNode(int val) { this.val = val; } } */ public class Solution {

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