A generic approach for the unranking of labeled combinatorial classes
A generic approach for the unranking of labeled combinatorial classes
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DOI:
10.1002/rsa.10025
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发表时间:
2001-10-01
影响因子:
1
通讯作者:
Molinero, X
中科院分区:
文献类型:
--
作者:
Martínez, C;Molinero, X
in this article, we design and analyze algorithms that solve the unranking problem (i.e.. generating a combinatorial structure of size, n given its rank) for a large collection of labeled combinatorial classes. those that can be built using operators like unions (+), products (*), sequences, sets. cycles, and substitutions. We also analyze the performance of these algorithms and show that the worst-case is o(n(2)) (o(nlogn) if the so-called boustrophedonic order is used), and provide an algebra for the analysis of the average performance and higher-order moments together with a few examples of its application. (C) 2001 John Wiley & Sons, Inc.