纯正土猫～—～# pets - 心有所宠
b*r
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Given a string S and a string T, count the number of distinct subsequences
of T in S.
Here is an example:
S = "rabbbit", T = "rabbit"
result is 3。
为什么结果是3呢？r, a, b, i, t不都是T得subsequence么？而且都在S里头？
of T in S.
Here is an example:
S = "rabbbit", T = "rabbit"
result is 3。
为什么结果是3呢？r, a, b, i, t不都是T得subsequence么？而且都在S里头？
