CONTEST ID : 1116 - 训练赛一(赛后订正)

A题提交地址:https://www.luogu.com.cn/problem/CF330A
B题提交地址:https://www.luogu.com.cn/problem/CF365A
C题提交地址:https://www.luogu.com.cn/problem/CF378B

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