16. leetcode 404. Sum of Left Leaves
Find the sum of all left leaves in a given binary tree.
Example:
3
/ \
9 20
/ \
15 7
There are two left leaves in the binary tree, with values 9 and 15 respectively. Return 24.
思路:还是递归。仔细看代码,体会递归的设计方法。
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