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NP完全性的概念为理解计算问题的复杂性提供了一个强大的工具。
The concept of NP-completeness has provided a powerful tool for understanding the complexity of computational problems.
Democracy is the worst form of government except for all those other forms that have been tried from time to time.
All the other children at my school are stupid. Except I’m not meant to call them stupid, even though this is what they are.