Section 1Understand Problem
Section 01
Understand the problem
Restate the problem precisely. Interviewers reward candidates who pause, define the contract, and name the guarantees before coding.
Problem statement
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
root = [3,9,20,null,null,15,7] → [[3],[9,20],[15,7]]
Constraints
0 ≤ tree size ≤ 2000 · −1000 ≤ Node.val ≤ 1000
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