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[LeetCode] Distinct Subsequences [29]

题目 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 relati…

子序列 sub sequence问题，例：最长公共子序列，[LeetCode] Distinct Subsequences(求子序列个数)

引言 子序列和子字符串或者连续子集的不同之处在于,子序列不需要是原序列上连续的值. 对于子序列的题目,大多数需要用到DP的思想,因此,状态转移是关键. 这里摘录两个常见子序列问题及其解法. 例题1, 最长公共子序列 我们知道最长公共子串的求法,先温习一下,它的求法也是使用DP思想,对于 字符串s1 和字符串s2,令 m[i][j] 表示 s1上以s1[i]结尾的子串和s2上s2[j]结尾的子串的最长公共子串长度,因为公共子串必须是连续的,因此状态转移方程:m[i, j] = (s1[i] ==…

[LeetCode] Distinct Subsequences 不同的子序列

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…

[leetcode]Distinct Subsequences @ Python

原题地址:https://oj.leetcode.com/problems/distinct-subsequences/ 题意: 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…

Leetcode 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 formed from the original string by deleting some (can be none) of the characters without disturbing the relative…

[LeetCode] Distinct Subsequences 解题思路

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…

LeetCode: Distinct Subsequences [115]

[称号] 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 rela…

LeetCode: Distinct Subsequences 解题报告

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 formed from the original string by deleting some (can be none) of the characters without di…

[Leetcode] distinct subsequences 不同子序列

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…

【LeetCode OJ】Distinct Subsequences

Problem Link: http://oj.leetcode.com/problems/distinct-subsequences/ A classic problem using Dynamic Programming technique. Let m and n be the length of the strings T and S. Let R[i][j] be the count of distinct subsequence of T[0..i] in S[0..j]. Obvi…