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A Dichotomy Theorem for First-Fit Chain Partitions
SIAM Journal on Discrete Mathematics ( IF 0.9 ) Pub Date : 2020-03-03 , DOI: 10.1137/18m1219862
Kevin G. Milans , Michael C. Wigal

SIAM Journal on Discrete Mathematics, Volume 34, Issue 1, Page 586-596, January 2020.
First-Fit is a greedy algorithm for partitioning the elements of a poset into chains. Let $\mathrm{FF}(w,Q)$ be the maximum number of chains that First-Fit uses on a $Q$-free poset of width $w$. A result due to Bosek, Krawczyk, and Matecki states that $\mathrm{FF}(w,Q)$ is finite when $Q$ has width at most $2$. We describe a family of posets $\mathcal{Q}$ and show that the following dichotomy holds: if $Q\in\mathcal{Q}$, then $\mathrm{FF}(w,Q) \le 2^{c(\log w)^2}$ for some constant $c$ depending only on $Q$, and if $Q\not\in\mathcal{Q}$, then $\mathrm{FF}(w,Q) \ge 2^w - 1$.


中文翻译:

初等链分配的二分法定理

SIAM离散数学杂志,第34卷,第1期,第586-596页,2020年1月。First
-Fit是一种贪婪算法,用于将位姿的元素划分为多个链。令$ \ mathrm {FF}(w,Q)$是First-Fit在无$ Q $宽度为$ w $的摆球上使用的最大链数。由于Bosek,Krawczyk和Matecki的结果,当$ Q ​​$的宽度最大为$ 2 $时,$ \ mathrm {FF}(w,Q)$是有限的。我们描述了一个坐姿家族$ \ mathcal {Q} $,并证明以下二分法成立:如果$ Q \ in \ mathcal {Q} $,则$ \ mathrm {FF}(w,Q)\ le 2 ^ { c(\ log w)^ 2} $表示某些常数$ c $,仅取决于$ Q $,如果$ Q \ not \ in \ mathcal {Q} $,则$ \ mathrm {FF}(w,Q) \ ge 2 ^ w-1 $。
更新日期:2020-03-03
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