队列 102 Binary Tree Level Order Traversal
队列的基本应用 - 广度优先遍历 1）树 ： 层序遍历； 2）图：无权图的最短路径。 使用队列来实现二叉树的层序遍历，需要多关注一个层数的信息 /**
* Definition for a binary tree node.
* struct TreeNode {
* int val;
* TreeNode *left;
* TreeNode *right;
*
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