Submit | All submissions | Best solutions | Back to list |
OPC3A - Arya and the exponacci |
Arya is very fond of Fibonacci numbers. He claimed he can solve any problem on Fibonacci number. His clever friend Golu gave him a challenge.
To prove his skills, he gave him a sequence which he called exponacci. The sequence is given by:
- g(0) = 1,
- g(n) = 2f(n - 1) for n > 0.
f(n) denotes the nth Fibonacci number where
- f(0) = 1,
- f(1) = 1,
- f(n) = f(n - 1) + f(n - 2) for n > 1.
(Obviously Golu is not as good as Arya in Fibonacci numbers so he believes f(0) = 1, anyways we have chosen not to disturb him.)
Help Arya to find the nth exponacci number. Since the numbers can be very large take mod 109 + 7.
Input
The first line of the input will be the number of test cases (T ≤ 2000). For each test case first line contains one integers n 0 ≤ n ≤ 1000000
Output
The value of g(n) % (109+7)
Example
Input: 2 3 5 Output: 4 32
Added by: | bashrc is back |
Date: | 2012-03-24 |
Time limit: | 1s |
Source limit: | 1000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All |
Resource: | Own problem used in MNNIT LOCAL OPC |
hide comments
|
|||||
2012-04-01 17:22:33 fitcat
From the definition of Fibonacci number, f(0) should be equal to 0. |
|||||
2012-04-01 17:22:33 numerix
@bashrc: Good decision. Thanks. |
|||||
2012-04-01 17:22:33 bashrc is back
@numerix: I see the point.And probably it must be clear to others from the comments that big integers may not pass.So i am opening for all languages. |
|||||
2012-04-01 17:22:33 numerix
@bashrc: That's what I supposed. So my questions: 1. Why, if bigint is the reason, is Java not excluded? 2. Why, if brute-force solutions obviously won't pass, is it not opened for all languages? |
|||||
2012-04-01 17:22:33 bashrc is back
@numerix I didn't wanted to distract newbie programmer's in using big number arithematic available in the languages i disallowed.In any case that solution won't pass. |
|||||
2012-04-01 17:22:33 numerix
Is there any reason for exclusion of some languages? If not, please open it for all languages. |
|||||
2012-04-01 17:22:33 ! include(L.ppt)
gud problem.....got ac with normal scanf.....:) Reply:C and C++ programmers can take the liberty of using any I/O.The warning was for slower languages. Last edit: 2012-03-24 17:21:35 |
|||||
2012-04-01 17:22:33 Francky
with only 2000 test cases, there's no IO problems imaginable, imho. Last edit: 2012-03-24 15:00:20 |