CONTEST ID : 1120 - 训练赛五(订正)

你不够努力,怎么变优秀! 
你不够努力,怎么比别人强! 
你不够努力,怎么能获奖!
订正地址:
A题:https://www.luogu.com.cn/problem/CF451A
B题:https://www.luogu.com.cn/problem/CF461A
C题:https://www.luogu.com.cn/problem/CF462B

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