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IEICE TRANSACTIONS on Information

Enumeration, Counting, and Random Generation of Ladder Lotteries

Katsuhisa YAMANAKA, Shin-ichi NAKANO

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Summary :

A ladder lottery, known as “Amidakuji” in Japan, is one of the most popular lotteries. In this paper, we consider the problems of enumeration, counting, and random generation of the ladder lotteries. For given two positive integers n and b, we give algorithms of enumeration, counting, and random generation of ladder lotteries with n lines and b bars. The running time of the enumeration algorithm is O(n + b) time for each. The running time of the counting algorithm is O(nb3) time. The random generation algorithm takes O(nb3) time for preprocess, and then it generates a ladder lottery in O(n + b) for each uniformly at random.

Publication
IEICE TRANSACTIONS on Information Vol.E100-D No.3 pp.444-451
Publication Date
2017/03/01
Publicized
2016/12/21
Online ISSN
1745-1361
DOI
10.1587/transinf.2016FCP0015
Type of Manuscript
Special Section PAPER (Special Section on Foundations of Computer Science — New Trends in Theoretical Computer Science —)
Category

Authors

Katsuhisa YAMANAKA
  Iwate University
Shin-ichi NAKANO
  Gunma University

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