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Re:不知道 怎么回事.帮忙!

Posted by fbixiaozc135 at 2007-07-16 20:29:10 on Problem 3210
In Reply To:不知道 怎么回事.帮忙! Posted by:d4114 at 2007-05-10 21:59:46
因为当coins全部同向时,最后要同向必然要翻转偶数次,所以若有偶数个coins时,若只有一个跟其他的反向时,必要翻转奇数次以达到目的。这两种情况矛盾,所以,偶数时题无解,对于奇数个coin,可由数学归纳法得到结果。

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