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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.
A good building is like a good friend - it gets better with time.
任何组织最有价值的资产是其员工,要明智地投资于他们。
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.