(3). The use of backtracking problem-solving usually contains the following three steps: a. In response to the problem, the definition of the solution space b. easy search to determine the structure of the solution space c. to depth-first search of the solution space, and pruning in the search process used to avoid invalid search function

huisufa 0-1beibao
.................\huisufa.dsp
.................\huisufa.dsw
.................\huisufa.ncb
.................\huisufa.opt
.................\huisufa.plg
.................\r.cpp

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