leetcode958. Check Completeness of a Binary Tree
題目鏈接 題目： 思路：將所有的結點全部押入隊列中，空也壓入，每次判斷隊列的頭如果隊列頭爲空了則跳出循環，如果此後隊列中還有非空元素則不是完全二叉樹。 /** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(
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