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arXiv 2202.12042cs.DS
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图划分为连通簇的参数化复杂性

Parameterized Complexity of Graph Partitioning into Connected Clusters

Ankit Abhinav, Susobhan Bandopadhyay, Aritra Banik, Saket Saurabh

摘要:

给定无向图$G$和$q$整数$n_1,n_2,n_3, \cdots, n_q$,平衡连通$q$ -划分问题($BCP_q$)询问是否存在将$G$的顶点集$V$划分为$q$部分$V_1,V_2,V_3,\cdots, V_q$使得对于所有$i\in[1,q]$,$|V_i|=n_i$和在$V_i$上导出的图是连通的.被表示为平衡连通$q$ -边划分问题($BCEP_q$)的相关问题被定义如下。给定无向图$G$和$q$整数$n_1,n_2,n_3, \cdots, n_q$,$BCEP_q$询问是否存在将$G$的边集划分为$q$部分$E_1,E_2,E_3,\cdots, E_q$,使得对于所有$i\in[1,q]$,$|E_i|=n_i$和边集上诱导的图$E_i$是连通的。在这里,我们研究的问题$q=2$和证明$BCP_q$为$q\geq 2$是$W[1]$ -困难的。我们还表明,$BCP_2$是不太可能有一个多项式核的类平面图。得到了肯定的结果,证明了$BCP_2$是一个以图的树宽为参数的固定参数可处理(FPT)算法,推广到平面图的FPT算法。我们设计了另一个FPT算法和一类由$\min(n_1,n_2)$参数化的单位圆盘图的多项式核。最后,我们证明了与$BCP_2$不同,$BCEP_2$是由$\min(n_1,n_2)$参数化的FPT。

英文摘要:

Given an undirected graph $G$ and $q$ integers $n_1,n_2,n_3, \cdots, n_q$, balanced connected $q$-partition problem ($BCP_q$) asks whether there exists a partition of the vertex set $V$ of $G$ into $q$ parts $V_1,V_2,V_3,\cdots, V_q$ such that for all $i\in[1,q]$, $|V_i|=n_i$ and the graph induced on $V_i$ is connected. A related problem denoted as the balanced connected $q$-edge partition problem ($BCEP_q$) is defined as follows. Given an undirected graph $G$ and $q$ integers $n_1,n_2,n_3, \cdots, n_q$, $BCEP_q$ asks whether there exists a partition of the edge set of $G$ into $q$ parts $E_1,E_2,E_3,\cdots, E_q$ such that for all $i\in[1,q]$, $|E_i|=n_i$ and the graph induced on the edge set $E_i$ is connected. Here we study both the problems for $q=2$ and prove that $BCP_q$ for $q\geq 2$ is $W[1]$-hard. We also show that $BCP_2$ is unlikely to have a polynomial kernel on the class of planar graphs. Coming to the positive results, we show that $BCP_2$ is fixed parameter tractable (FPT) parameterized by treewidth of the graph, which generalizes to FPT algorithm for planar graphs. We design another FPT algorithm and a polynomial kernel on the class of unit disk graphs parameterized by $\min(n_1,n_2)$. Finally, we prove that unlike $BCP_2$, $BCEP_2$ is FPT parameterized by $\min(n_1,n_2)$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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