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Problem 3551 >> 题意有没有跟我一样没读清的QAQ

Fuxey @ 2016-06-03 11:14:37

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如果lastans == -1 则不变，我理解成如果lastans == -1 就不改变lastans的值……　我语死早

suika @ 2018-06-25 20:27:41

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同。。。

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