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Re:这题的递推式,欢迎大家讨论

Posted by nower at 2009-07-02 13:53:03 on Problem 1090
In Reply To:这题的递推式,欢迎大家讨论 Posted by:nower at 2009-07-02 12:16:35
> 令f[n]表示将串a[1]到a[n]变为0的最小步数,f[0]=0,
> 令g[n]表示将串a[1]到a[n]变为a[1]到a[n-1]为0但a[n]为1的最小步数,g[0]=0
> n>=1时,如果a[n]=0,f[n]=f[n-1];如果a[n]=1,f[n]=g[n-1]+2^(n-1);
> n>=1时,如果a[n]=1,g[n]=f[n-1];如果a[n]=0,g[n]=g[n-1]+2^(n-1);

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