题目地址(111. 二叉树的最小深度 - 力扣（LeetCode）)

https://leetcode.cn/problems/minimum-depth-of-binary-tree/description/

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/