2021/7/20 Vjudge 训练赛 ABCDE题解

比赛链接

密码 ： 020210720

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A - This is an interesting question By 刘鑫龙

B - Check-in question？ By 葛云霄

C - A magical problem of number theory By 李德旺

D - The Legend of the Elevator By 王俊越

E - Easy genes By 杨熠辰

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