Editorial for DMOPC '14 Contest 2 P2 - Cutting Logs

Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.

Fairly straightforward, but be careful of corner cases such as when the first or last piece is bad, or multiple bad sections in a row. Don't output empty strings.


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