标签:左右 amp 代码 hal desc body @param red def
翻转一棵二叉树。左右子树交换。
样例 1:
输入: {1,3,#}
输出: {1,#,3}
解释:
1 1
/ => 3 3
样例 2:
输入: {1,2,3,#,#,4}
输出: {1,3,2,#,4}
解释:
1 1
/ \ / 2 3 => 3 2
/ 4 4
递归固然可行,能否写个非递归的?
代码:
"""
Definition of TreeNode:
class TreeNode:
def __init__(self, val):
self.val = val
self.left, self.right = None, None
"""
class Solution:
"""
@param root: a TreeNode, the root of the binary tree
@return: nothing
"""
def invertBinaryTree(self, root):
# write your code here
if not root:
return
self.invertBinaryTree(root.left)
self.invertBinaryTree(root.right)
root.left, root.right = root.right, root.left
当然,使用先序遍历也可以
标签:左右 amp 代码 hal desc body @param red def
原文地址:https://www.cnblogs.com/bonelee/p/11609991.html