problem0404

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404. Sum of Left Leaves

题目

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.

解题思路

见程序注释

Documentation

Index

• type TreeNode

Types

type TreeNode

type TreeNode = kit.TreeNode