/**

 @defgroup tsp Traveling Salesman Problem

 @ingroup algs

 \brief Algorithms for the symmetric traveling salesman problem

 This group contains basic heuristic algorithms for the the symmetric

 \e traveling \e salesman \e problem (TSP).

 Given an \ref FullGraph "undirected full graph" with a cost map on its edges,

 the problem is to find a shortest possible tour that visits each node exactly

 once (i.e. the minimum cost Hamiltonian cycle).

 These TSP algorithms should be used with a

 metric cost function. Otherwise, they could yield worse results.

 LEMON provides five well-known heuristics for solving symmetric TSP:

  - \ref NearestNeighborTsp Neareast neighbor algorithm

  - \ref GreedyTsp Greedy algorithm

  - \ref InsertionTsp Insertion heuristic (with four selection methods)

  - \ref ChristofidesTsp Christofides algorithm

  - \ref Opt2Tsp 2-opt algorithm

 \image html tsp.png

 \image latex tsp.eps "Traveling salesman problem" width=\textwidth

 */