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.
计算给定二叉树的所有左叶子之和。
- 这一题是微软的面试题。递归求解即可
0404.Sum-of-Left-Leaves
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