Given a string s, return the number of distinct non-empty subsequences of s. Since the answer may be very large, return it modulo 109 + 7. A subsequence of a string is a new string that is formed from the original string by deleting some (can be none) of the characters without distu...
新博文地址:[leetcode]Distinct Subsequences Distinct Subsequences Given a string S and a string T, count the number of distinct subsequences of T in S. A subsequence of a string is a new string which is for...Leetcode - Distinct Subsequences My code: 真的没想到这道题目我可以自己做出来。
刚开始博主也是考虑用一个一维数组 dp,其中 dp[i] 表示以 S[i] 结尾的不同子序列的个数,就像 [这个帖子](https://leetcode.com/problems/distinct-subsequences-ii/discuss/192030/Java-DP-ON2N2-time-greater-ONN-time-greater-O11-space) 中定义的一样,但是状态转移方程不好推导,那个帖子虽然代码可以跑通...
Given a stringS, count the number of distinct, non-empty subsequences ofS. Since the result may be large, return the answer modulo10^9 + 7. Example 1: Input:"abc" Output:7 Explanation: The 7 distinct subsequences are "a", "b", "c", "ab", "ac", "bc", and "abc". Example 2:...
Can you solve this real interview question? Distinct Subsequences - Given two strings s and t, return the number of distinct subsequences of s which equals t. The test cases are generated so that the answer fits on a 32-bit signed integer. Example 1
LeetCode解题之Distinct Subsequences 原题 给定两个字符串S和T,求T有多少种从属于S的子序列的情况。 或者说S能够删除它自己随意个字符。可是不能改变字符的相对位置。那一共同拥有多少种删法能够使S变为T。 注意点: 删除随意个字符包含不删除字符 样例: 输入: s = “rabbbit”, t = “rabbit” 输出:......
【Leetcode】 Distinct Subsequences https://leetcode.com/problems/distinct-subsequences/ 题目: S and a string T, count the number of distinct subsequences of T in S. "ACE"is a subsequence of"ABCDE"while"AEC"Here is an example: S ="rabbbit", T ="rabbit"3....
# @return: Count the number of distinct subsequences def numDistinct(self, S, T): if S is None or T is None: return 0 if len(S) < len(T): return 0 if len(T) == 0: return 1 num = 0 for i, Si in enumerate(S): if Si == T[0]: num += self.numDistinct(S[i + 1...
LeetCode Distinct Subsequences LeetCode解题之Distinct Subsequences 原题 给定两个字符串S和T,求T有多少种从属于S的子序列的情况。 或者说S能够删除它自己随意个字符。可是不能改变字符的相对位置。那一共同拥有多少种删法能够使S变为T。 注意点: 删除随意个字符包含不删除字符...
Distinct Subsequences LeetCode:Distinct Subsequences 我的LeetCode解题报告索引 题目链接 Given a stringSand a stringT, count the number of distinct subsequences ofTinS. A subsequence of a string is a new string which is formed from the original string by deleting some (can be none) of the ...