Given stringSand adictionary of wordswords, find the number ofwords i that is a subsequence ofS. Note: All words inwordsandSwill only consists of lowercase letters. The length ofSwill be in the range ...
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问题 给出字符串S和T，计算S中为T的不同的子序列的个数。 一个字符串的子序列是一个由该原始字符串通过删除一些字母（也可以不删）但是不改变剩下字母的相对顺序产生的一个新字符串。如，ACE是ABCDE的一个子序列，但是AEC不是。 这里有一个例子： S＝“rabbbit”，T＝“rabbit ...
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 ...
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 ...
Given a string S, find the number of different non-empty palindromic subsequences in S, and return that number modulo 10^9 + 7. A subsequence ...
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. ...
You are given an integer array sorted in ascending order (may contain duplicates), you need to split them into several subsequences, where each ...
Given a string S and a string T, count the number of distinct subsequences ofT inS. A subsequence of a string is a new string which is formed from ...
Given a chemical formula (given as a string), return the count of each atom. An atomic element a ...
