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:...
115. Distinct Subsequences Given two strings s and t, returnthe number of distinctsubsequencesofswhich equalst. The test cases are generated so that the answer fits on a 32-bit signed integer. Example 1: Input:s = "rabbbit", t = "rabbit"Output:3Explanation:As shown below, there are 3 ...
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 formed from the original string by deleting some (can be none) of the characters without disturbing the relative positions of the remaining characters....
【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....
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 characters without disturbing the relative positions of the remaining characters. (ie,"ACE...
leetcode:Distinct Subsequences lintcode:Distinct Subsequences Problem Statement 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 characters with...
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 ...
S ="rabbbit", T ="rabbit" Return3. 原问题链接:https://leetcode.com/problems/distinct-subsequences/ 问题分析 这个问题相对来说比较难找到思路。对于给定的源串s来说,要让它的子串能够构成目标串t,那么理论上可能是它里面的任何一个元素可能存在或者删除。如果按照这个思路,假设源串长度为m的话,那么对它里...
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...