Given a string S and a string T, count the number of distinct subsequences of S which equals T. A subsequence of a string is a new string which ...
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 返回值應為 初始思路 要找出子序列的個數,首先要有找出S中為T的子序列的方法。T是S的子序列,首先其每一個字母肯 ...
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Given a string S and a string T, count the number of distinct subsequences of S which equals T. A subsequence of a string is a new string which ...
Given a string S, count the number of distinct, non-empty subsequences of S . Since the result may be large, return the answer modulo 10^9 + 7. ...
引言 子序列和子字符串或者連續子集的不同之處在於,子序列不需要是原序列上連續的值。 對於子序列的題目,大多數需要用到DP的思想,因此,狀態轉移是關鍵。 這里摘錄兩個常見子序列問題及其解法。 例題1, 最長公共子序列 我們知道最長公共子串的求法,先溫習一下,它的求法也是使用DP思想 ...
題目: 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 ...
我的LeetCode解題報告索引 題目鏈接 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 ...
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 ...
Given string S and a dictionary of words words, find the number of words[i] that is a subsequence ...
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 ...