The conversion of mass crime is a difficult problem in judicatory practice, as it does not bring to bear accurate theory to guide.
聚众犯罪的转化犯在司法实践中是一个较为疑难的问题，主要原因是没有运用正确的理论加以指导。
The TSP problem is considered as classical optimization grouping problem, which is widely used in practice, but it is real a difficult NP problem.
旅行商问题作为经典的组合优化问题，实际中的应用非常广泛，但它却是一个NP完全问题。
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