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LARSUBP - Large subsequence Problem |
Given a string S which contains only digit-characters. How many subsequences can be obtained from S such that every digit is strictly greater than all previous digits in that subsequence.
As for example if S=7598 then there are 8 subsequences which follow the above constraint. These are 7, 5, 9, 8, 79, 78, 59, 58. Notice that 7598 is not a required subsequence because 7 > 5 and 9 > 8.
Note: A subsequence is a sequence that can be derived from another sequence by deleting some elements without changing the order of the remaining elements.
Input
Input starts with an integer T (≤ 1000), denoting the number of test cases. Each case contains a string S. The length of S does not exceed 10000. S does not contain any leading zeros.
Output
For each case, print the a string(without quotes) "Case i: " followed by number of subsequences where "i" is test case number. Answer may be very large, so output it modulo 10^9+7.
Example
Input:2
4
7598 Output: Case 1: 1
Case 2: 8
For small constraints: www.spoj.com/problems/SUBP/
Added by: | P_Quantum |
Date: | 2014-06-21 |
Time limit: | 1s-4s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 |
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2014-06-23 21:42:52 Gnirut Zet Wall
Corrected, AC. Last edit: 2014-06-22 11:15:59 |