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几篇小说

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isee Posted 2018-11-11 16:24 |Read mode
一本书由30篇小说组成,每篇的篇幅分别是1页,2页,…,30页。小说从第1页开始刊印,且每篇均由新的一页开头,试问从奇数页码开头的小说,至多有几篇?
























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realnumber Posted 2018-11-11 21:58
偶数页小说15篇(2页,4页,..30页)先排,都是奇数页开始,
再15篇奇数页小说,有8篇奇数页开头。
所以最多23篇。
因为把偶数页小说放在奇数页开头,则它下一本也是奇数页开始.所以最好都放奇数页开始.
奇数页小说放奇数页开头的话,后面跟奇数好.

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realnumber Posted 2018-11-11 22:01
最多23篇时,有几种排法,似乎也可以解的样子

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