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Bill is developing a new mathematical theory for human emotions. His recent investigations are dedicated to studying how good or bad days influent people's memories about some period of life. A new id...

链接：https://www.nowcoder.com/acm/contest/106/I来源：牛客网It’s universally acknowledged that there’re innumerable trees in the campus of HUST. There is a row of trees along the East-9 Road which con...