[LeetCode 115] - 不同子序列(Distinct Subsequences)
問題 給出字符串S和T，計算S中為T的不同的子序列的個數。 一個字符串的子序列是一個由該原始字符串通過刪除一些字母（也可以不刪）但是不改變剩下字母的相對順序產生的一個新字符串。如，ACE是ABCDE的一個子序列，但是AEC不是。 這里有一個例子： S＝“rabbbit”，T＝“rabbit ...
原文：[LeetCode] 940. Distinct Subsequences II 不同的子序列之二
Given a stringS, count the number of distinct, non empty subsequences ofS. Since the result may be large,return the answer modulo . Example : Example : Example : Note: Scontains only lowercase letter ...
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