第23874题 单选
给定序列s1={1,3,4,5,6,7,7,8,1}、s2={3,5,7,4,8,2,9,5,1},二者的最长公共子序列是以下哪个?
A

{3,5,7,8,1}

B

{3,4,5,7,8}

C

{5,7,8}

D

{3,5,7,9,1}