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Partition into heapable sequences, heap tableaux and a multiset extension of Hammersley’s process

Domenii publicaţii > Ştiinţe informatice + Tipuri publicaţii > Articol în volumul unei conferinţe

Autori: Gabriel Istrate, Cosmin Bonchis

Editorial: Proceedings of the 26th Annual Symposium on Combinatorial Pattern Matching (CPM'2015), Lecture Notes in Computer Science vol. 9133, p.261-271, Springer Verlag, 2015.


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We investigate partitioning of integer sequences into heapable subsequences (previously defined and studied by Byers et al. We show that an extension of patience sorting computes the decomposition into a minimal number of heapable subsequences (MHS). We connect this parameter to an interactive particle system, a multiset extension of Hammersley’s process, and investigate its expected value on a random permutation. In contrast with the (well studied) case of the longest increasing subsequence, we bring experimental evidence that the correct asymptotic scaling is $frac{1+sqrt{5}}{2} · ln(n)$. Finally we give a heap-based extension of Young tableaux, prove a hook inequality and an extension of the Robinson-Schensted correpondence.

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Cuvinte cheie: heapable sequence, Young tableaux