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问题： Ivan is fond of collecting. Unlike other people who collect post stamps, coins or other material stuff, he collects software bugs. When Ivan gets 阅读全文
posted @ 2017-12-08 12:21
nimphy
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问题： You live in a village but work in another village. You decided to follow the straight path between your house (A) and the working place (B), but t 阅读全文
posted @ 2017-12-08 10:21
nimphy
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