The Mirror Flip
A easy Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Python
- Difficulty
- easy
- Seniority
- L3
Interview Prompt
A binary tree arrives as nested dicts, where each node is `{"val": int, "left": node or null, "right": node or null}` and a missing child is `null`. Return its mirror image: at every node the left and right children are swapped, all the way down to the leaves. A `null` root returns `null`.
Summary
Sometimes the fastest fix is to swap everything.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your python solution with real code execution
- Get instant feedback and a hire/no-hire decision