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MAIN74 - Euclids algorithm revisited |
Consider the famous Euclid algorithm to calculate the GCD of two integers (a, b):
int gcd(int a, int b) { while (b != 0) { int temp = a; a = b; b = temp % b; } return a; }
for input (7, 3) the 'while' loop will run 2 times as follows: (7, 3) => (3, 1) => (1, 0)
Now given an integer N you have to find the smallest possible sum of two non-negative integers a, b (a >= b) such that the while loop in the above mentioned function for (a, b) will run exactly N times.
Input
First line of input contains T (1 <= T <= 50) the number of test cases. Each of the following T lines contains an integer N (0 <= N <= 10^18).
Output
For each test case print the required answer modulo 1000000007 in a separate line.
Example
Input: 1 1 Output: 2
Explanation: (1,1) is the required pair.
Added by: | Mahesh Chandra Sharma |
Date: | 2011-03-13 |
Time limit: | 1s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 |
Resource: | Own problem used for NSIT-IIITA main contest #7 |
hide comments
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2024-03-10 23:13:40
EZ AC IN SEVEN IZI PIZI |
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2020-10-06 19:50:38
This article helped me a lot : https://www.cut-the-knot.org/blue/LamesTheorem.shtml You can read the part which is about Knuth's deduction Last edit: 2020-10-06 19:52:36 |
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2020-07-28 20:52:10
Lames Theorem, edge cases: n=0 and n=1; also try spoj problems:FIBOSUM,RABBIT1 |
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2020-06-20 13:34:22
be carefull about negative value for test case 1 1000000000001 |
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2020-05-05 20:50:13
Nice problem. |
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2020-04-20 12:08:07
beware of n=0, cost me 3WAs . |
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2019-11-09 16:19:57
good question! Last edit: 2019-11-09 16:20:39 |
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2019-09-23 20:11:50
Great question, leart a whole another concept. Binary exponentiation and matrix exponentiation :) Thank you for this question |
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2019-07-28 16:51:31
Use Lame's Theorem ! EZ |
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2019-05-26 06:20:40
Finally AC after 6WA. Because of silly mistake. Learnt lots of things. |