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 values9and15respectively. Return24.

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Binary Tree · leetcode · Trees# 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 values9and15respectively. Return24.