题目地址(117. 填充每个节点的下一个右侧节点指针 II - 力扣（LeetCode）)

https://leetcode.cn/problems/populating-next-right-pointers-in-each-node-ii/

题目地址(199. 二叉树的右视图 - 力扣（LeetCode）)

https://leetcode.cn/problems/binary-tree-right-side-view/description/

题目地址(429. N 叉树的层序遍历 - 力扣（LeetCode）)

https://leetcode.cn/problems/n-ary-tree-level-order-traversal/description/

题目地址(515. 在每个树行中找最大值 - 力扣（LeetCode）)

https://leetcode.cn/problems/find-largest-value-in-each-tree-row/description/