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DIVFIBS - Divisible Fibonacci Numbers |
In mathematics, the Fibonacci sequence is calculated by adding the previous two members of the sequence. The first few Fibonacci numbers are
1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...
Considering the indices start from 1 the 6th Fibonacci number in this sequence is 8 and is divisible by 1, 2, 4 and 8. You are given two indices L and R (L<=R) of this sequence and you have to calculate how many Fibonacci numbers are divisible by M in range [L, R] inclusive.
Input
Input begins with a line containing a single integer T (1<=T<=500), denoting the number of test cases. T test cases follow. Each test case begins with a line containing three integers L R (1<=L<=R<=100000) and M (1<=M<=1018).
Output
For each test case, output a single line containing the answer as an integer.
Example
Input: 3 6 6 4 4 18 5 1 10 3 Output: 1 3 2
Added by: | imranziad |
Date: | 2015-12-08 |
Time limit: | 1s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 GOSU JS-MONKEY |
hide comments
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2016-07-16 21:46:33 Francky
This one should be put in tutorial section... == Try http://www.spoj.com/problems/DIVFIBS2/ : Brute force will not pass !!! ;-) Last edit: 2016-07-16 21:47:53 |
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2016-07-16 08:35:25 Piyush Kumar
O! Brute Force passes :) ! |
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2016-07-01 14:48:55
finally removed this from my to-do list after 6 months.really nice problem.. <3 |
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2016-02-28 22:16:15 abhi
wrong answer is because of overflow. Take mod and then store the numbers |
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2015-12-20 00:02:09 kp
check for 1 2 2 1 ans : 1 |
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2015-12-19 21:39:09 priyank
nice one |
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2015-12-12 15:01:14 mehmetin
Problem could be changed to have harder constraints, then rejudged (maybe something like T = 5000) Last edit: 2015-12-12 15:06:40 |
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2015-12-11 04:27:26 :.Mohib.:
Unable to figure out why getting WA, @admin please check my code where I am failing?? |
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2015-12-10 08:33:23 shadowfax
@Prakhar Dev Gupta can't find your source code :( I'd say try to simulate for larger fib numbers like 100th. |
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2015-12-10 08:18:54 shadowfax
@Lakshman please check case: L=6, R=9, M=2. The answer should be 2. Last edit: 2015-12-10 08:51:43 |