# formula for gcd of two numbers

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### UVa 11417 GCD (Euler φ function)

11417-gcd Time limit:2.000 seconds Http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=24&page=show_problem &problem=2412 Given the value of N, you'll have to find the value of G. The definition of G is given below:

### Codeforces Round #323 (Div. 2) C. GCD Table

C. GCD TableThe GCD table G of size n x n for an array of positive integers a of lengt H n is defined by formula Let us remind your that the greatest common divisor (GCD) of the positive integers x and y is the greatest integer which

### Hdoj 1787 GCD Again (Euler function)

GCD AgainTime limit:1000/1000 MS (java/others) Memory limit:32768/32768 K (java/others)Total submission (s): 2611 Accepted Submission (s): 1090problem DescriptionDoes spent some time to think and try to solve those unsolved problem after one ACM

### Hdoj 1787 GCD Again (Euler function)

GCD AgainTime limit:1000/1000 MS (java/others) Memory limit:32768/32768 K (java/others)Total submission (s): 2611 Accepted Submission (s): 1090problem DescriptionDoes spent some time to think and try to solve those unsolved problem after one ACM

### GCD&amp;EXGCD algorithm

PrefaceFor many number theory problems, it is necessary to involve GCD, solve gcd, and often use Euclidean algorithm.For many solving problems, the Bézout equation can be listed: AX+BY=GCD (A, B), with the EXGCD solution to the answer, EXGCD is the

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### BZOJ2818 GCD "Euler function, linear sieve"

Main topic:Give a range [1,n], find out two numbers x, Y, make gcd (x, y) a prime number, ask how many pairs (x, y order)Solution:Not difficult, Euler function practiced hand problem, you can define the set P ={x|x to prime, then we enumerate gcd (x,

### bjfu1211 push formula, sieve prime

The title is the value of the fun (n)Fun (N) = GCD (3) +GCD (4) +...+GCD (i) +...+GCD (n).GCD (n) =gcd (c[n][1],c[n][2],......, c[n][n-1])C[n][k] means the number of the by-choose K things from N things.N Max 1 million, which is immediately

### Basic knowledge of Number Theory

Basic knowledge of Number Theory This article briefly introduces the Integer Set z = {..., -2 ,...} And natural number set n = {0, 1, 2 ,...} The most basic concept of number theory. Division and appointment The concept that an integer can be

### The beauty of programming-the charm ofnumbers

1. The number of 1 in the binary of integer V [Cpp]Int Count (int v){Int num = 0;While (v){Num + = v & 0x01;V >>> = 1;}Return num;} Int Count (int v){Int num = 0;While (v){V & = (v-1 );Num ++;}Return num;}How many digits are different in the binary

### HDU 4910 hdoj problem about GCD bestcoder #3 fourth question

First, when M = 1, ANS = 0For M> 1Given that numbers from 1 to 1 have a mass of M, a group is formed on the Multiplication Modulo operation of M.Ai = (1 Therefore, for a, B = a ^ (-1) = inv (a) makes a * B = 1 (mod m)There are two casesA! = B. Then,

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