At last, based on another equivalent reformulation, we embed the 2-approximation algorithm and a 2-opt exchange local search into a hybrid genetic algorithm. By comparison with CPLEX solver, numerical experiments validate the effectiveness of the proposed algorithms....
It was shown that relaxing the EDS problem to minimization over this polytope introduces an integrality gap of 2.1, and an approximation algorithm with the same factor was designed based on it [3]. Moreover, when G is bipartite or unweighted, (1) is sufficient to bound the integrality gap ...
1.5 approximation algorithm of TSP Algorithm 获得MST T 在MST的偶数度数顶点中计算最小代价完全匹配M,将M加入到T中获得欧拉图H 在H上获得欧拉回路C 基于FINDTOUR相同的算法从C构建出一条欧拉回路 引理:偶数顶点minimum cost perfect matching的代价 设V′⊆V,|V′|为偶数,M是V′上的minimum cost perfect ma...
Approximation algorithm: LP + relaxation Source: Williamson and Shmoys. The Design of Approximation Algorithms. Cambridge University Press, 2010. __EOF__
The first algorithm has an approximation ratio of ${3/2+frac{6}{n-4}}$ in the case that n/2 is odd, and of ${3/2+frac{5}{n-1}}$ in the case that n/2 is even. Furthermore, we show that this algorithm is applicable to real world problems as it yields close to optimal ...
A 2 1/10-Approximation Algorithm for a Generalization of the Weighted Edge-Dominating Set Problem We study the approximability of the weighted edge-dominating set problem. Although even the unweighted case is NP-Complete, in this case a solution of size... R Carr,T Fujito,G Konjevod,... ...
今天开始,我们一起来学习经典密码分析算法 - LLL。首先,做个背景介绍。 0. Introduct 在这节课中,我们描述了一个最短向量问题(SVP)的近似算法。 这种算法是1982年由K.Lenstra, H.W.Lenstra, Jr. and L.Lovasz 设计的,后被称为LLL算法,给出了一个 (23)n 的近似比例 (approximation ratio),其中 n 是格...
百度试题 题目For problem X, a 2-approximation algorithm is also a 3-approximation algorithm.相关知识点: 试题来源: 解析 正确 反馈 收藏
Approximation algorithms for TSP with neighborhoods in the plane In the Euclidean TSP with neighborhoods (TSPN), we are given a collection of regions ((1)-approximation algorithm for the case of neighborhoods that are (i... A Dumitrescu,JSB Mitchell - 《Journal of Algorithms》 被引量: 389...
Approximation algorithms for 2-stage stochastic optimization problems - Swamy, Shmoys () Citation Context ...retical computer science community where stochastic versions of several classical combinatorial optimization problems have been studied. Some general techniques have also been developed [11, 19]. ...