# finding gcd

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### Summary of GCD and ex_gcd

Gcd () --- indicates the maximum common number. The common method is Euclidean algorithm. Ex_gcd () --- Extended Euclidean Algorithm Definition 1: A and B are two integers not all 0, that is, the maximum common divisor of A and B is the maximum

### HDU 5869 Different GCD subarray Query tree array + some math backgrounds

http://acm.hdu.edu.cn/showproblem.php?pid=5869Test instructions: Given an array, and then given a number of queries, asking [L, R], how many of the GCD of the subarray are different.is the GCD value of the different intervals in [L, R], and how many

### uva12716 GCD XOR (table finding rule + sieve method)

Test instructions: Input integer (1=Problem Solving Ideas:See after the topic has been looking for greatest common divisor and different or between the relationship, but found for a long time did not find. So the decisive table found the following

### Poj 2429 GCD &amp; amp; LCM Inverse [java] + [mathematics], poj2429gcd

Poj 2429 GCD & LCM Inverse [java] + [mathematics], poj2429gcd GCD & LCM Inverse Time Limit:2000 MS   Memory Limit:65536 K Total Submissions:9928   Accepted:1843 DescriptionGiven two positive integers a and B, we

### POJ 2429 GCD &amp; LCM Inverse "java" + "math"

GCD & LCM Inverse Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 9928 Accepted: 1843 DescriptionGiven positive integers A and B, we can easily calculate the greatest common

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### [Hdoj] 4983 goffi and GCD

The meaning of the question is very clear, that is, finding the different logarithm that satisfies gcd (n-a, n) * gcd (n-B, n) = n ^ K (A, B. Obviously gcd (n-a, n) 2, the condition (a, B) does not exist ). When K = 2, only (n, n) meet the

### Extended Euclidean algorithm

Euclidean algorithmEuclidean algorithm, also known as the greatest common divisor method, is used to calculate two integers, a, b, and so on.Basic algorithm: Set A=qb+r, where a,b,q,r are integers, then gcd (A, B) =gcd (b,r), gcd (A, B) =gcd (b,a%b).

### Mathematical problems--expanding Euclidean algorithm

First, expand Euclidean algorithmThe algorithm is used to solve the problem of a given two nonzero integers a and B, to find a set of integer solutions (x, y) so that ax + by = gcd ( A, A, b) is established, where GCD (A, a, a, a) represents the

### Bestcode #6-1003 HDU 4983 goffi and GCD [Euler's function]

Question link: http://acm.hdu.edu.cn/showproblem.php? PID = 1, 4983 Give N and K to find the conditions that meet Gcd (n? A, n) × gcd (n? B, n) = NK . A and B. First, we can obtain the gcd (n, x) N = 1. This was the first time I thought about

### Euclid and the extended Euclidean algorithm

Turn from online Daniel Blog, speak of easy to understand.Original address: http://www.cnblogs.com/frog112111/archive/2012/08/19/2646012.htmlEuclidean algorithmEuclidean algorithm, also known as the greatest common divisor method, is used to

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