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# Untitled

a guest Mar 22nd, 2019 73 Never
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1. # 输入一棵二叉树，判断该二叉树是否是平衡二叉树。
2.
3. # class TreeNode:
4. #     def __init__(self, x):
5. #         self.val = x
6. #         self.left = None
7. #         self.right = None
8.
9. class Solution:
10.     def IsBalanced_Solution(self, pRoot):
11.         return self.get_balanced_and_height(pRoot)[0]
12.
13.     def get_balanced_and_height(self, p):
14.         if p is None:
15.             return True, 0
16.         lb = self.get_balanced_and_height(p.left)
17.         rb = self.get_balanced_and_height(p.right)
18.         height = max(lb[1], rb[1]) + 1
19.         balanced = (-1 <= lb[1] - rb[1] <= 1)
20.         if lb[0] and rb[0]:
21.             return balanced, height
22.         else:
23.             return False, height
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