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

  1. ft(5) is 19. 19 % 20 = 19
  2. ft(10) is 276. 276 % 77 = 45
  3. 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
2015-06-22 19:59:22
Ac at 1 go... solve FIBOSUM before this to get an idea about the realm of Fibonacci :P
2015-05-21 17:00:32 kartikay singh
o(logn) passed:)
take care of negative modulus B-)
2015-03-03 16:30:19 #include
got wa for n=0. AC now
2014-12-31 10:42:51 Abhishek
For having WA at (7) , Check your test case against big numbers like
1
1000000 1000007

check overflow!
2014-12-29 13:45:56 Manraj Singh
O(log(N)) solution.Check for n=0 and n=1.Costed me 2 WAs.
2014-12-06 07:00:54 Pawankumar P
4 WAs for MOD. Fibonacci sequence have so many secrets, good problem. :)
2014-10-03 20:54:15 NOVICE
very similar to FIBOSUM///
2014-09-03 14:54:45 Devashish
@shreya sahu ...
1000000000 you declaring a array of long long this size it is 8 GB!!!!! btw
normal method(even with dp) will lead to memory overflow. The pyramid cluster 733MHz can approx. do 10^6 0r 10^7 calculations per sec. ..
2014-08-08 12:49:52 shreya sahu
runtime error. :(
<snip>

Last edit: 2023-05-16 20:33:00
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