//leetcode.com/problems/distinct-subsequences-ii/description/ * * algorithms * Hard (40.31%) * Likes: 229 * Dislikes: 11 * Total Accepted: 7.2K * Total Submissions: 17.6K * Testcase Example: '"abc"' * * Given a string S, count the number of distinct, non-empty subsequences of S ...
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:...
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 string S, count the number of distinct, non-empty subsequences of S . 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", ...
题目地址:https://leetcode.com/problems/distinct-subsequences-ii/description/ 题目描述 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: ...
嗯这里更具体讲一讲,思路是怎么一步一步想的。 最开始的思路是用Trie来表示所有可能subseq.遍历string S,对Trie中每个节点新建叶节点。提交后果然答案对了,但...
Leetcode - Distinct Subsequences My code: publicclassSolution{publicintnumDistinct(Strings,Stringt){if(s==null||t==null){return0;}elseif(s.length()==0){return0;}elseif(t.length()==0){returns.length();}intm=s.length();intn=t.length();int[][]dp=newint[m][n];intcounter=0;...
115*. Distinct Subsequences 题目描述(困难难度) 给定两个字符串S和T,从S中选择字母,使得刚好和T相等,有多少种选法。 解法一 递归之分治 S 中的每个字母就是两种可能选他或者不选他。我们用递归的常规思路,将大问题化成小问题,也就是分治的思想。
* @return: Count the number of distinct subsequences */ int numDistinct(string &S, string &T) { if (S.size() < T.size()) return 0; if (T.empty()) return 1; vector<vector<int> > f(S.size() + 1, vector<int>(T.size() + 1, 0)); for (int i = 0; i < S.size()...
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...