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多项式时间归约的概念对于理解NP完全问题的结构至关重要。
The concept of polynomial-time reduction is central to understanding the structure of NP-complete problems.
What can be said at all can be said clearly, and what we cannot talk about we must pass over in silence.
"The only thing to do with good advice is to pass it on. It is never of any use to oneself."