An $O(n^{2}(m$ + $\textit{N}log$ $\textit{n})log$ $\textit{n})$ min-cost flow algorithmAn $O(n^{2}(m$ + $\textit{N}log$ $\textit{n})log$ $\textit{n})$ min-cost flow algorithm

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 Author Galil, Zvi ♦ Tardos, va Source ACM Digital Library Content type Text Publisher Association for Computing Machinery (ACM) File Format PDF Copyright Year ©1988 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science Abstract The minimum-cost flow problem is: Given a network with $\textit{n}$ vertices and $\textit{m}$ edges, find a maximum flow of minimum cost. Many network problems are easily reducible to this problem. A polynomial-time algorithm for the problem has been known for some time, but only recently a strongly polynomial algorithm was discovered. In this paper an $\textit{O}(\textit{n}2(\textit{m}$ + $\textit{n}$ log $\textit{n})log$ $\textit{n})$ algorithm is designed. The previous best algorithm, due to Fujishige and Orlin, had an $\textit{O}(\textit{m}2(\textit{m}$ + $\textit{n}log\textit{n})log\textit{n})$ time bound. Thus, for dense graphs an improvement of two orders of magnitude is obtained.The algorithm in this paper is based on Fujishige's algorithm (which is based on Tardos's algorithm). Fujishige's algorithm consists of up to $\textit{m}$ iterations, each consisting of $\textit{O}(\textit{m}$ log $\textit{n})$ steps. Each step solves a single source shortest path problem with nonnegative edge lengths. This algorithm is modified in order to make an improved analysis possible. The new algorithm may still consist of up to $\textit{m}$ iterations, and an iteration may still consist of up to $\textit{O}(\textit{m}log\textit{n})$ steps, but it can still be shown that the total number of steps is bounded by $\textit{O}(\textit{n}2log\textit{n}.$ The improvement is due to a new technique that relates the time spent to the progress achieved. ISSN 00045411 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 1988-04-01 Publisher Place New York e-ISSN 1557735X Journal Journal of the ACM (JACM) Volume Number 35 Issue Number 2 Page Count 13 Starting Page 374 Ending Page 386

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Source: ACM Digital Library