leetcode958. Check Completeness of a Binary Tree
题目链接 题目： 思路：将所有的结点全部押入队列中，空也压入，每次判断队列的头如果队列头为空了则跳出循环，如果此后队列中还有非空元素则不是完全二叉树。 /** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(
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