retrospective (b a c k t r a c k i n g) is a systematic search to answer the question. To achieve retrospective, the first issue of the need for a definition of the solution space (solution space), The space must contain at least one solution to the problem (which may be optimal). Rats in a maze problem, we can contain a definition from the entrance to the export of the solution space trails; n is the object of the 0/1 knapsack problem (see 1. 4 and 2. 2) The solution space is a reasonable choice of two n length of the 0 n/a vector set, this assembly that it will 0 or 1 x allocated to all possible ways. When n = 3, the solution space for the ((0, 0, 0), (0, 1, 0), (0, 0, 1), (1, 0, 0), (0, 1, 1), (1, 0, 1), (1, 1, 0), (1, 1, 1)).

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