Leetcode #404 Sum of Left Leaves
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Description
Find the sum of all left leaves in a given binary tree.
Example
3
/ \
9 20
/ \
15 7There are two left leaves in the binary tree, with values 9 and 15 respectively. Return 24.
Explain
判断是否为左子树并且是否不存在子树，都满足则加上这个val
ps：才发现leetcode可以加参数= =
Code
# Definition for a binary tree node.# class TreeNode(object):# def __init__(self, x):# self.val = x# self.left = None# self.right = Noneclass Solution(object): def sumOfLeftLeaves(self, root, isleft=False): """ :type root: TreeNode :rtype: int """ if not root: return 0 if not root.left and not root.right: return root.val if isleft else 0 return self.sumOfLeftLeaves(root.left, True) + self.sumOfLeftLeaves(root.right, False) 0 0
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