Solving Binary Tree Level Order Traversal in go. Please try yourself first to solve the problem and submit your implementation to LeetCode before looking into solution.

Problem Description

Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level).

For example: Given binary tree [3,9,20,null,null,15,7],

   / \
  9  20
    /  \
   15   7

return its level order traversal as:


See the full details of the problem Binary Tree Level Order Traversal at LeetCode

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