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Quick Summary
Find the maximum length of a contiguous substring that contains at most two consecutive identical characters.
The algorithm must process strings up to 100,000 characters efficiently within linear time.
A single traversal with dynamic boundary adjustments yields the optimal result.
What This Tests
Sliding window technique
Pointer manipulation and boundary handling
Real-time constraint validation
Linear time complexity optimization
Common Patterns
Sliding Window
Two Pointers
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python
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