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SICNU 2019 winter training #2（codeforces #531 Div3）

　　A - Integer Sequence Dividing 　　签到，思维拓展 You are given an integer sequence 1,2,…,n1,2,…,n. You have to divide it into two sets AAand BB in such a w...

比赛 codeforces

2019-01-11

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