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POWFIB - Fibo and non fibo |
The problem is simple - find (ab) % MOD, where:
- a = Nth non-Fibonacci number.
- b = (Nth Fibonacci number) % MOD.
- MOD = 109+7.
Consider Fibonacci series as 1, 1, 2, 3 ...
Note: It is guaranteed that Nth non-Fibonacci number will always be less than MOD value for every value of N used.
Input
First line contains T, the number of test cases.
Each next T lines contains a number N.
Output
Print T lines of output where each line corresponds to the required answer.
Announcement: Constraints are updated. Sorry for inconvenience occurred.
Example
Input: 3 3 2 1 Output: 49 6 4
Explanation
- For N=3 : 3rd non Fibonacci number = 7, 3rd Fibonacci number = 2. answer = 72 % MOD = 49
- For N=2 : 2nd non Fibonacci number = 6, 2nd Fibonacci number = 1. answer = 61 % MOD = 6
- For N=1 : 1st non Fibonacci number = 4, 1st Fibonacci number = 1. answer = 41 % MOD = 4
Constraints
1 ≤ T ≤ 100000
1 ≤ N ≤ 9×108
Note: Test cases have been updated and constraints are changed. Those who get TLE or WA are suggested to resubmit. GOOD LUCK there.
Added by: | ivar.raknahs |
Date: | 2015-07-15 |
Time limit: | 1s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 JS-MONKEY |
Resource: | OWN |
hide comments
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2022-12-06 14:07:56
<snip> [Simes]: read the footer, don't post code here Last edit: 2022-12-06 17:09:38 |
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2022-12-06 12:20:51
How to find a number that is not Fibonacci? |
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2021-04-14 06:33:20
@nimphy is correct I think.... "b" should be calculated under modulo (MOD-1) and not MOD. This link should explain why is it so -> https://www.geeksforgeeks.org/find-power-power-mod-prime/ If this is wrong, then please could someone explain why "b" should be computed under modulo MOD and not (MOD-1)? [NG]: There is nothing one "should" do here other than what the problem statement stipulates. Last edit: 2021-04-14 08:28:05 |
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2018-05-17 02:33:45
when I get “b”,I should mod 1e9+7-1,right? But I get WA; while mod 1e9+7 get AC。What is the problem~~~~ |
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2017-08-27 20:00:35
Wrong answer on test case 14 but why!! |
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2017-01-02 15:06:28
I have got 3 WAs. I am sure my code is correct. :/ WA on 14th test. Everytime. -_- EDIT: Got it. Stupid mistake -_- Anyways I have got AC in 6.06 s. Is there any better approach, I used matrix exponentiation? Last edit: 2017-01-08 20:47:53 |
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2016-07-29 17:19:18 Ketan Chandak
O(T*log(n)) gives TLE with scanf/printf. Too tight Time Limit? |
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2016-06-05 09:21:23 Sarthak Munshi
@ivar.raknahs : can you please check my latest submission . Last edit: 2016-06-05 16:53:07 |
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2016-02-25 08:31:07
using matrix exponantion....AC in one go. |
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2016-01-14 13:25:05 shubham
Nice question!!! constraints are good. |