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Ordered Character Check
A easy Python interview practice problem on DataDriven. Write and execute real python code with instant grading.
- Domain
- Python
- Difficulty
- easy
- Seniority
- staff
Problem
Our state machine validator needs to verify that transitions follow the correct order. Write a function called all_before that takes a string of only 'A' and 'B' characters and returns True if every A comes before every B. Empty strings and single-character strings return True.
Practice This Problem
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