The Encoded Signal
A medium Python mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Python
- Difficulty
- medium
- Seniority
- L4
Interview Prompt
Decode a telemetry encoding for 26 letter frequencies (a..z). Rules: digits 0-9 map to positions a-j; '#' followed by a digit (NN#) means positions k-z (24#=x, 26#=z). '(n)' denotes multi-digit count n enclosed. Return a 26-element integer list of counts for each letter. (The test pattern gives '1(2)2(3)324#26#(5)': a=2, b=3, c=1, d..j=0, x=1, z=5.)
Summary
The encoding is hiding multipliers. Decode it.
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