DSUBSEQ - Distinct Subsequences

Given a string, count the number of distinct subsequences of it (including empty subsequence). For the uninformed, a subsequence of a string is a new string which is formed from the original string by deleting some of the characters without disturbing the relative positions of the remaining characters.
For example, "AGH" is a subsequence of "ABCDEFGH" while "AHG" is not.


First line of input contains an integer T which is equal to the number of test cases. You are required to process all test cases. Each of next T lines contains a string s.


Output consists of T lines. Ith line in the output corresponds to the number of distinct subsequences of ith input string. Since, this number could be very large, you need to output ans%1000000007 where ans is the number of distinct subsequences.




Constraints and Limits

T ≤ 100, length(S) ≤ 100000
All input strings shall contain only uppercase letters.

hide comments
hitachi: 2013-05-15 02:43:16

for those getting WA#1...problem is i think in the mod operation

Last edit: 2013-05-15 02:45:16
:-): 2013-04-24 15:36:17

awesome problem

codecracker: 2013-04-01 23:18:55

mod(x)=x%m working fine...no need for increasing overhead

_maverick: 2013-03-23 16:08:57

wow DP problems fill ma life a gud classic one...
and don't forget to mod costed me one WA ;)

Kartik Singal: 2012-08-17 23:24:36

nice problem

npsabari: 2012-07-11 18:17:59


Symon Rahman: 2012-05-17 21:15:38

Can anyone tell me what is the meaning of WA#1

Symon Rahman: 2012-05-17 21:03:58

What is the test case 1, I got wa so many times, but my code is right

Praneeth.N: 2012-05-16 08:33:44

I am getting correct answer for the test cases mentioned in the question.But I am getting wrong answer #0.Somebody please kindly explain..Thanks in advance

Giorgos Christoglou: 2012-05-15 17:16:28

wrong answer at testcase 0 .

Added by:Ajay Somani
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: CPP
Resource:CodeCraft 08, Problem Setter: Jin Bin