Given a non-empty binary tree, return the average value of the nodes on each level in the form of an array.
Example 1:
Input: 3 / \ 9 20 / \ 15 7 Output: [3, 14.5, 11] Explanation: The average value of nodes on level 0 is 3, on level 1 is 14.5, and on level 2 is 11. Hence return [3, 14.5, 11].
Note:
- The range of node's value is in the range of 32-bit signed integer.
# -*- coding:utf-8 -*-
__author__ = 'yangxin_ryan'
"""
Solutions:
题目的意思就是计算每层二叉树的平均值,这里我们使用BFS,层级遍历,每次遍历后均可计算出均值
"""
import collections
class AverageOfLevelsInBinaryTree(object):
def averageOfLevels(self, root: