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Quick Summary
Reconstruct all possible original digit strings from a single count-and-say encoding.
Parse ambiguous count segments that can be either one or two digits long.
Validate constraints like no leading zeros and maximum count of 99 during exploration.
What This Tests
Backtracking recursion and state restoration
Dynamic string segmentation
Boundary and format validation
Exponential search space handling
Common Patterns
Backtracking
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Input
encoded =
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