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The only way to avoid mistakes is to have no new ideas.
No matter what happens in life, be good to people. Being good to people is a wonderful legacy to leave behind.
一个问题如果在计算机上可以快速解决,那么它属于P类问题;如果一个解可以快速验证,那么它属于NP类问题。
The idea is more important than the object.