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现在知道了,谢谢number!

Posted by gmds at 2005-09-18 10:48:51 on Problem 2441
In Reply To:这个题DP只需要一个(1<<20)的数组 Posted by:number at 2005-09-18 10:01:41

> f[i][1<<20]实际上只用了0..1<<20中二进制表示后1的个数是i的那一部分
> f[i+1][1<<20]只用了1的个数是i+1的那一部分.
> 所以只用一个f[1<<20]就可以了.

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