Holding the Center
A hard Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Python
- Difficulty
- hard
- Seniority
- L5
Interview Prompt
A latency monitor emits a reading after every request, and a live dashboard refreshes the median of all readings seen so far each time one arrives. Given `stream`, the readings in arrival order, return the running median after each reading, taking the average of the two middle values whenever an even number of readings has arrived. Each median comes back as a float, and a stream of a single reading reports that reading itself.
Summary
The middle value keeps moving as new data arrives.
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