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Given a binary tree, return the sum of values of its deepest leaves.
Example 1:
Input: root = [1,2,3,4,5,null,6,7,null,null,null,null,8]
Output: 15
Constraints:
The number of nodes in the tree is between 1 and 10^4.
The value of nodes is between 1 and 100.
给你一棵二叉树,请你返回层数最深的叶子节点的和。
示例:
输入:root = [1,2,3,4,5,null,6,7,null,null,null,null,8]
输出:15
提示:
树中节点数目在 1 到 10^4 之间。
每个节点的值在 1 到 100 之间。