Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the infinite loops pattern
The tab freezes, nothing prints, and the loop condition never becomes false.
What went wrong: done == True checks whether done is True. It does not change done, so the loop never stops.
The fix: done = True
Remember: = stores a value, == compares two values.
The pattern behind it: infinite loops.
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