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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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2019-04-19 16:03:40
Easy peasy :) |
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2018-08-09 20:19:11
NIce Question. |
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2018-03-23 23:13:52
Nice problem. Reduces to Matrix Exponentiation and Fibonacci Sequences :P PS N=0 is an Edge case! Last edit: 2018-03-23 23:14:31 |
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2017-01-16 18:10:58 NIKHIL KUMAR SINGH
xpshekhar --> spoiler :/ :/ :/ |
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2016-12-28 21:30:01 Akul Goel
take care of the boundary case(s). took me almost 2 hours to find my mistake. |
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2016-01-26 20:06:41 Govind Lahoti
Awesome Problem! Learnt a lot, made my day :) |
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2015-12-28 13:32:42 MAYANK NARULA
a >= b was an important one !!! |
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2015-12-25 23:55:00
nice question and concept. http://zobayer.blogspot.in/2010/11/matrix-exponentiation.html |
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2014-05-27 22:04:40 Adhitya Kamakshidasan
Nice question. Learnt a new algorithm! |
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2013-09-12 15:55:37 :(){ :|: & };:
Nice test cases,there was a fault in my fib generator but it had passed every other problem except this one. |