The description of the original algorithm could be found in the paper, 'A New Implementation Of Yen's Ranking Loopless Paths Algorithm' (http://citeseer.ist.psu.edu/martins00new.html).
IntroductionYen’s algorithm is one of derivation algorithms for ranking the K shortest paths between a pair of nodes 1. It always searches the shortest paths in a “pseudo”tree containing K shortest loopless paths. The very shortest one is obtained in the first place, and the second shortest path is always explored on the basis of the shortest paths that are shorter. In our paper, we exploit the implementation of Yen’s algorithm in 1. Compared with the straightforward implementation of Yen’s algorithm, the one present in 1 is proved to have a better performance in computational experiments, although the complexity of them are the same, O(Kn(m+nlogn)) in the worst case analysis.
ImplementationC++ language is used to implement Yen's algorithm, because of its high performance. In the implementation, we exploit the graph package in the boost c++ libraries 2, when calculating the shortest path in the graph. 2 provides the Fortran implementation of this algorithm. Java version is added. New C# version is added. ReferenceM. Pascoal and E. Martins. A new implementation of Yen’s ranking loopless paths algorithm. 4OR – Quarterly Journal of the Belgian, French and Italian Operations Research Societies, 2003. http://www.mat.uc.pt/~eqvm/OPP/KSPP/KSPP.html. Boost C++ Libraries, http://www.boost.org/. UpdateA fix on the comparator associated with Class QYDirectedPath is provided for the CPP implementation. Thanks a lot to timothyahahn. The implementation of topk shortest path algorithm in C# by Vinh Bui (vinhqb@gmail.com) is added. Note that I don't test this code completely.
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