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:
影响因子:
--
通讯作者:
Solomon, Shay
中科院分区:
文献类型:
--
作者:
Le, Hung;Solomon, Shay
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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DOI:
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发表时间:
2005
期刊:
International Colloquium on Automata, Languages and Programming
影响因子:
--
作者:
L. Roditty;M. Thorup;Uri Zwick
通讯作者:
Uri Zwick
影响因子:
0.5
作者:
B. Awerbuch
通讯作者:
B. Awerbuch
DOI:
--
发表时间:
2003
期刊:
International Colloquium on Automata, Languages and Programming
影响因子:
--
作者:
Surender Baswana;Sandeep Sen
通讯作者:
Sandeep Sen
影响因子:
2.1
作者:
B. Wu;K. Chao;C. Tang
通讯作者:
C. Tang
DOI:
10.1145/3199607
发表时间:
2016
期刊:
ACM Transactions on Algorithms (TALG)
影响因子:
--
作者:
S. Chechik;Christian Wulff
通讯作者:
Christian Wulff