Geodesic
Applications of a Special Polynomial Class of Tsp
Yugoslav journal of operations research, Tome 15 (2005) no. 1, p. 5 .

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A hypothetical problem which we call a “buried treasure problem” is presented where the objective is to locate m objects among N fixed equi-spaced caches in order to minimize a measure of the risk of loss. The general problem is shown to be NP- hard. However, a sub problem may be solved as a special class of TSP in O (N log N) time. Several applications are noted.
Keywords: Partition problem, traveling salesman problem, pyramidal tours. 
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Jack Brimberg; Ephraim Korach; Mokhtar Amami. Applications of a Special   Polynomial Class of Tsp. Yugoslav journal of operations research, Tome 15 (2005) no. 1, p. 5 . http://geodesic.mathdoc.fr/item/YJOR_2005_15_1_a0/