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.

Input

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

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.

Example

Input:
3
AAA
ABCDEFG
CODECRAFT

Output:
4
128
496

Constraints and Limits

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


Added by:Ajay Somani
Date:2008-02-05
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: CPP
Resource:CodeCraft 08, Problem Setter: Jin Bin

hide comments
2016-08-19 06:59:29
why I can't solve it top-down ?
2016-08-16 09:50:23 Avik Sarkar
Be Careful With MOD .. The subtraction you are doing to remove the multiple occurrences may cause a negative result . That's why you have make it Positive .
2016-06-22 06:52:59
ACCEPTED in first go such a nice ques... takes time but nice dp
2016-05-29 18:04:54
what is the maximum length of input string?
2016-05-26 21:43:02
Thank you @PRANJIT BHARALI! Your comment saved me! I had totally forgotten about the MOD, got WA and was going mad testing different self-made test cases.
People...
"be careful with MOD ...!!!"
2016-05-17 15:23:51
Misread Max String Length as 10,000. Got SegFault. AC in 2nd Attempt. :)
2016-05-12 12:47:02 Megreli
I have o(n) solution in Java and getting TLE :\
2016-04-19 07:57:18
The best!!
2016-04-15 15:39:14 Archit Jain
really nice DP
2016-03-24 09:17:58
Woaaahhh! Gr8 Question. Done in O(n) :) .... Thanks to Shashank Tiwari for the tips! :D

Last edit: 2016-03-24 09:19:35
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