Near-Optimal Spanners for General Graphs in (Nearly) Linear Time

Near-Optimal Spanners for General Graphs in (Nearly) Linear Time
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(近)线性时间内一般图的近最优 Spanner

DOI:
10.1137/1.9781611977073.132
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发表时间:
2022
期刊:
Proceedings of the 2022 Annual ACM-SIAM Symposium on Discrete Algorithms
影响因子:
--
通讯作者:
Solomon, Shay
Solomon, Shay
中科院分区:
--
文献类型:
--
作者:
Le, Hung;Solomon, Shay

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设G =(V,E,w)是上的一个加权无向图,|V| = n个顶点,|E| = medges,设k ≥ 1为任意整数,设k < 1为任意参数。我们提出了以下结果,快速构建spectrometry与接近最佳的稀疏度和亮度,1这是一个长期的工作在这一领域的高潮。(近似最优的意思是在Erdos'围长猜想下的最优的,并且不考虑依赖性。有(确定性)算法可以构造G的(2k-1)(1 + k)-空间,其近似最优稀疏度为O(n1/k· log(1/k)/k))。第一个算法在指针机器模型中可以在时间O(mα(m,n)· log(1/n)/n)+ SORT(m))内实现,其中α(·,·)是两参数逆Ackermann函数,SORT(m)是排序器所需的时间.第二个算法可以在Word RAM模型中实现,时间为O(mlog(1/k)/n))。有一个(确定性)算法可以构造G的(2k-1)(1 + k)-k,该算法在稀疏度和亮度上都达到O(n1/k·poly(1/k))的近最优界。该算法在指针机模型和Word RAM模型中的实现时间分别为O(m α(m,n)· poly(1/n)+ SORT(m))和O(mα(m,n)· poly(1/n)),而在(2k-1)(1 + n)-spectrometry中,即使不考虑亮度,其最快的构造时间也为isO(min{m(n1+1/k)+nlogn,k·n2+1/k}).重要的是,2k-1段的贪婪生成器具有稀疏性O(n1/k)-没有任何依赖性,但它的运行时间是O(m(n1+1/k+nlogn))。此外,任何(2k-1)-bandwidth(包括贪婪bandwidth)的最新亮度界限都很差,即使不考虑稀疏性和运行时间。
LetG= (V, E, w) be a weighted undirected graph on |V| = nvertices and |E| = medges, letk≥ 1 be any integer, and let∊< 1 be any parameter. We present the following results on fast constructions of spanners with near-optimal sparsity and lightness,1which culminate a long line of work in this area. (Bynear-optimalwe mean optimal under Erdos' girth conjecture and disregarding the∊-dependencies.)There are (deterministic) algorithms for constructing (2k–1)(1 +∊)-spanners forGwith a near-optimal sparsity ofO(n1/k· log(1/∊)/∊)). The first algorithm can be implemented in the pointer-machine model within timeO(mα(m, n) · log(1/∊)/∊)+ SORT(m)), whereα(·,·) is the two-parameter inverse-Ackermann function and SORT(m) is the time needed to sortmintegers. The second algorithm can be implemented in the Word RAM model within timeO(mlog(1/∊)/∊)).There is a (deterministic) algorithm for constructing a (2k–1)(1 +∊)-spanner forGthat achieves a near-optimal bound ofO(n1/k·poly(1/∊)) on both sparsity and lightness. This algorithm can be implemented in the pointer-machine model within timeO(mα(m,n) · poly(1/∊) + SORT(m)) and in the Word RAM model within timeO(mα(m,n) · poly(1/∊)).The previous fastest constructions of (2k–1)(1 +∊)-spanners with near-optimal sparsity incur a runtime of isO(min{m(n1+1/k) +nlogn, k·n2+1/k}), even regardless of the lightness. Importantly, thegreedy spannerfor stretch 2k–1 has sparsityO(n1/k) — with no∊-dependence whatsoever, but its runtime isO(m(n1+1/k+nlogn)). Moreover, the state-of-the-art lightness bound of any (2k–1)-spanner (including the greedy spanner) is poor, even regardless of the sparsity and runtime.
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