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Thank you fans for your continuous support, without you there would be no me today.
A problem is in P if it can be solved quickly by a computer, and in NP if a solution can be verified quickly.
发愤研究学问,常常忘记吃饭,一旦有所收获便又高兴地忘记了忧愁,连自己的渐趋衰老也没有感觉到。