SEQ  Recursive Sequence
Sequence (a_{i}) of natural numbers is defined as follows:
a_{i} = b_{i} (for i <= k)
a_{i} = c_{1}a_{i1} + c_{2}a_{i2} + ... + c_{k}a_{ik} (for i > k)
where b_{j} and c_{j} are given natural numbers for 1<=j<=k. Your task is to compute a_{n} for given n and output it modulo 10^{9}.
Input
On the first row there is the number C of test cases (equal to about 1000).
Each test contains four lines:
k  number of elements of (c) and (b) (1 <= k <= 10)
b_{1},...,b_{k}  k natural numbers where 0 <= b_{j} <= 10^{9} separated by spaces
c_{1},...,c_{k}  k natural numbers where 0 <= c_{j} <= 10^{9} separated by spaces
n  natural number (1 <= n <= 10^{9})
Output
Exactly C lines, one for each test case: a_{n} modulo 10^{9}
Example
Input: 3 3 5 8 2 32 54 6 2 3 1 2 3 4 5 6 6 3 24 354 6 56 57 465 98765432 Output: 8 714 257599514
hide comments
Vipul Pandey:
20141202 01:44:19
nice one to learn a lot of things. 

Anirudh:
20141202 01:44:19
Are there any tricky cases in this? 

Heisenberg:
20141202 01:44:19
learnt a lot solving this problem :) 

যোবায়ের:
20141202 01:44:19
after solving this, try https://www.spoj.pl/problems/SPP/ 
Added by:  PaweÅ‚ Dobrzycki 
Date:  20050429 
Time limit:  0.5s3s 
Source limit:  8196B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All 
Resource:  IV Podlasian Contest in Team Programming 