标签:
Invert a binary tree.
4 / 2 7 / \ / 1 3 6 9
to
4 / 7 2 / \ / 9 6 3 1
将根节点的root.left 与 root.right 交换。
递归调用 左子树与右子树分别进行相同的操作。
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 public TreeNode invertTree(TreeNode root) { 12 if (root == null) { 13 return null; 14 } 15 TreeNode left = invertTree(root.left); 16 TreeNode right = invertTree(root.right); 17 root.left = right; 18 root.right = left; 19 return root; 20 21 } 22 }
标签:
原文地址:http://www.cnblogs.com/FLAGyuri/p/5286032.html