404. Sum of Left Leaves

作者: matrxyz | 来源:发表于2018-01-16 13:22 被阅读0次

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：

Time Complexity: O(N) Space Complexity: O(N)

Solution Code：

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404. Sum of Left Leaves