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[LeetCode]Distinct Subsequences 匹配(不要求连续)的子串
一开始第一反映是用暴搜+回溯剪枝,妥妥的超时,见numDistinct0函数。 后来想到这跟公共子串有点类似,满足最优子结构和重叠问题,因此可用DP。 状态转移方程如下:             { dp[i-1,j-1]+dp[i-1][j] , 当s[i]==s[j],0 dp[i,j]={ dp[i-1][j],                     当s[i]!=s[j] ,0 ...
分类:其他好文   时间:2014-11-09 23:51:47    阅读次数:256
[Leetcode] Distinct Subsequences
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 orig...
分类:其他好文   时间:2014-10-30 07:06:13    阅读次数:171
Distinct Subsequences 解题报告
题目:给两个字符串S和T,判断T在S中出现的次数。 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" is a subsequence...
分类:其他好文   时间:2014-10-19 17:09:51    阅读次数:190
Distinct Subsequences
[leetcode]Given a string S and a string T, count the number of distinct subsequences of T in S....
分类:其他好文   时间:2014-10-15 13:53:50    阅读次数:147
UVA 11081 Strings(DP)
Given 3 strings of only lowercase letter you have to count the number of ways you can construct the third string by combining two subsequences from the first two strings.             After deleting ...
分类:其他好文   时间:2014-10-10 02:06:23    阅读次数:174
[leetcode]Distinct Subsequences @ Python
原题地址:https://oj.leetcode.com/problems/distinct-subsequences/题意:Given a stringSand a stringT, count the number of distinct subsequences ofTinS.A subseq...
分类:编程语言   时间:2014-10-08 00:56:04    阅读次数:262
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 non...
分类:其他好文   时间:2014-10-02 16:03:39    阅读次数:188
Distinct Subsequences [leetcode] DP,空间复杂度O(T.size)
求S中和T相同的子串的个数。 递推公式: dp(i,j):S[0...i-1]和T[0...j-1]中不同子串的个数。 dp(0,j) = 0 dp(i,0) = 1 一般情况下 dp(i,j) = dp(i-1,j-1) + dp(i-1,j)    S[i-1] == T[j-1],保留S[i-1]以及丢弃S[i-1]           = dp(i-1,j)...
分类:其他好文   时间:2014-09-26 19:57:38    阅读次数:153
uva 10069 Distinct Subsequences 【dp+大数】
题目:uva 10069 Distinct Subsequences 题意:给出一个子串 x 和母串 s ,求子串在母串中的不同序列的个数? 分析:定义dp【i】【j】:x 的前 i 个字母在 s 的前 j 个字母中的出现次数; dp [ i ] [ j ] = dp [ i ] [ j - 1 ] ;          if ( x[ i ] == s [ j ] ) ...
分类:其他好文   时间:2014-09-17 18:45:42    阅读次数:327
Leetcode dp Distinct Subsequences
Distinct Subsequences  Total Accepted: 15484 Total Submissions: 62324My Submissions Given a string S and a string T, count the number of distinct subsequences of T in S. A subsequence of ...
分类:其他好文   时间:2014-09-16 22:09:51    阅读次数:204
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