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FIBTWIST - Fibonacci With a Twist |
Fibonacci numbers are given by
- f(n) = f(n-1) + f(n-2)
with f(0) = 0 and f(1) = 1.
first number of series ------ 0 1 1 2 3 5 8 13
Now let's have a new series called "Fibonacci Twist" which is given by
- ft(n) = ft(n-1) + ft(n-2) + (n-1)
with ft(0) = 0 and ft(1) = 1.
with first few number in the series ----- 0 1 2 5 10 19 34 59
Now your task is to find ft(n).
Since the number can be big you have to find the result mod M.
Input
first line having single number 't' -- number of test cases.
Next t lines have 2 number each 'n' and 'M'
Output
Single number given the n-th term mod M
Example
Input: 3 5 20 10 77 15 111 Output: 19 45 69
Constraints
- 10 <= t <= 100
- 0 <= n <= 10^9
- 100 <= M <= 10^9
Explanation
- ft(5) is 19. 19 % 20 = 19
- ft(10) is 276. 276 % 77 = 45
- ft(15) is 3177. 3177 % 111 = 69
Added by: | Devil D |
Date: | 2012-04-19 |
Time limit: | 0.100s-1s |
Source limit: | 20000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 |
Resource: | Own |
hide comments
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2012-11-23 12:36:53 Pranshul Agarwal
AC in 0.01 sec with 2X2 matrix.. :D |
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2012-07-21 11:45:54 007: Name stolen
please check my solution its giving NZEC http://www.spoj.pl/files/src/7352268/ |
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2012-06-30 19:45:45 Gurpreet Singh
Please check my submissions. Don't know why its getting WA. I have checked it using data type as 'int' and 'long long'. Yet WA... |
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2012-05-31 03:44:00 Suraj D
@Problem Setter. Could you please tell me where I fail? Submission Id 7065432. Thanks. |
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2012-05-28 07:46:26 Adrian Jaskó³ka
TO PROBLEMSETTER: Test cases are weak. Look at my submission 7050497. I have there table int c[3][3] (instead of long long!). 1 1000000000 1000000007 output should be 21, and my code is giving 347003493. Last edit: 2012-05-28 07:47:01 |
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2012-05-18 08:39:26 Aditya Pande
AC in 0.01 s Last edit: 2012-10-02 06:54:56 |
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2012-05-02 10:38:49 Paras Sharma
Can you please check my submission : 6934365 It should work. ------ Be careful with the limits and checks. you are getting wrong answer for 1 input in test case 1. your logic may also give TLE ... Last edit: 2012-05-12 08:56:28 |
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2012-04-28 07:21:41 Saurabh Jain
AC.:) Last edit: 2012-06-24 07:12:53 |
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2012-04-20 19:51:12 Pranay
@Tarun: yes |
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2012-04-20 17:21:17 Tarun Chabarwal
can it be solved with lower than 4x4 matrix? |