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p126_2
- 邮箱问题:150个邮箱,从邮箱2开始,打开所有偶数编号邮箱的门,接着从编号3开始,每隔3个邮箱,若门关着则打开,开着则关闭,随后每隔4个重复此过程,再每隔5个重复此过程,如此下去。判断最后哪些邮箱关着-E-mail questions: 150 mailboxes from the mailbox 2 starts, open the door all the even-numbered mailbox, and then start from number three, every three