通常有以下三种途径处理NP-难问题： 精确算法 ( Exact Algorithms ): 针对问题的一些特殊情况或 者小规模情形，我们可以设计这样的算法，它可以在可行 的时间内求得准确解或者最优解。
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Handbook of Exact String-Matching Algorithms 字符串匹配算法手册
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The complexity of solving the model with exact algorithms completely was studied and showed that an exact algorithm could not meet the practical requirement in time.
分析了该模型用精确算法进行求解的复杂性，指出对实际问题若完全采用精确算法求解往往达不到实时响应的要求。
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