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这题的递推式，欢迎大家讨论令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); Followed by:
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