The variable-round dealer's-choice pile shuffle sort problem is NP-hard, shown by reductions from SAT using a new chain-automaton encoding of pile type schedules.
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Sorting by pile shuffles on queue-like and stack-like piles can be hard
The variable-round dealer's-choice pile shuffle sort problem is NP-hard, shown by reductions from SAT using a new chain-automaton encoding of pile type schedules.