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arXiv 1812.09552math.PR
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随机字中最长公共子序列长度的方差

On the Variance of the Length of the Longest Common Subsequences in Random Words With an Omitted Letter

Christian Houdré, Qingqing Liu

摘要:

我们研究了两个大小为$n$的独立随机单词的最长公共序列长度的方差,其中一个单词的字母是独立同分布的。从$\{α_1, α_2, \cdots, α_m\}$中统一抽取,而另一个单词的字母是独立同分布的。从$\{α_1, α_2, \cdots, α_m, α_{m+1}\}$中提取,概率$p > 0$是$α_{m+1}$,而$(1-p)/m > 0$是所有其他字母。在$n$中,该长度的方差的阶数是线性的。

英文摘要:

We investigate the variance of the length of the longest common subsequences of two independent random words of size $n$, where the letters of one word are i.i.d. uniformly drawn from $\{α_1, α_2, \cdots, α_m\}$, while the letters of the other word are i.i.d. drawn from $\{α_1, α_2, \cdots, α_m, α_{m+1}\}$, with probability $p > 0$ to be $α_{m+1}$, and $(1-p)/m > 0$ for all the other letters. The order of the variance of this length is shown to be linear in $n$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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