LeetCode 1302. Deepest Leaves Sum

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/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     struct TreeNode *left;
 *     struct TreeNode *right;
 *[......]<p class="read-more"><a href="https://www.gerrytang.top/?p=878">Read more</a></p>