Mock Coding Interview: Solving Binary Tree Level Order Traversal
Watch a full mock coding interview where the candidate tackles Binary Tree Level Order Traversal — one of the most common BFS problems asked at top tech companies. This coding interview covers the entire problem-solving process from clarifying questions through a working solution with complexity analysis.
The interviewer presents LeetCode 102 (Binary Tree Level Order Traversal) and evaluates the candidate's approach in real time. You'll see how to break down the problem, choose BFS with a queue over DFS, track levels correctly, handle edge cases like an empty tree, and walk through a concrete example to verify the solution. The interviewer also discusses time and space complexity — O(n) where n is the number of nodes — before giving feedback and moving on to a second problem.
0:00 Problem introduction: Binary tree level order traversal
0:28 Clarifying questions and edge cases
0:56 Approach discussion: BFS with queue
2:03 Start coding the solution in Python
5:32 Walkthrough with example tree
7:49 Verifying with additional test cases
9:27 Interviewer feedback and minor bug fix
9:57 Moving on to second problem
Problem link:
LeetCode 102 — Binary Tree Level Order Traversal: https://leetcode.com/problems/binary-...
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