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The Window Cleaner
A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.
- Domain
- Python
- Difficulty
- medium
- Seniority
- mid, senior
Problem
Write a function that takes a string and returns the length of the longest substring that contains no repeating characters.
Practice This Problem
Solve this Python problem with real code execution. DataDriven runs your Python code in a sandboxed Docker environment and grades it instantly.