A note on the prize collecting traveling salesman problem
Mathematical Programming: Series A and B
A General Approximation Technique for Constrained Forest Problems
SIAM Journal on Computing
Improved Approximation Algorithms for PRIZE-COLLECTING STEINER TREE and TSP
FOCS '09 Proceedings of the 2009 50th Annual IEEE Symposium on Foundations of Computer Science
An O(log n/ log log n)-approximation algorithm for the asymmetric traveling salesman problem
SODA '10 Proceedings of the twenty-first annual ACM-SIAM symposium on Discrete Algorithms
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We present a primal-dual ⌈log(n)⌉-approximation algorithm for the version of the asymmetric prize collecting traveling salesman problem, where the objective is to find a directed tour that visits a subset of vertices such that the length of the tour plus the sum of penalties associated with vertices not in the tour is as small as possible. The previous work on the problem [9] is based on the Held-Karp relaxation and heuristic methods such as the Frieze et al.'s heuristic [6] or the recent Asadpour et al.'s heuristic for the ATSP [2]. Depending on which of the two heuristics is used, it gives respectively 1 + ⌈log(n)⌉ and 3+8 log(n)/log(log(n)) as an approximation ratio. Our approximation ratio ⌈log(n)⌉ outperforms the first in theory and the second in practice. Moreover, unlike the method in [9], our algorithm is combinatorial.