Google now allows Gmail users to change their @gmail.com email addresses while keeping the old address as an alias. Users can change their address up to three times with a mandatory 12-month waiting period between changes. The old address continues to work…

Can you solve this real interview question? Binary Tree Level Order Traversal - Given the root of a binary tree, return the level order traversal of its nodes' values. (i.e., from left to right, level by level).

 

Example 1:

[https://assets.leetcode.c…