扩展欧几里德算法—求解不定方程，线性同余方程

#include<stdio.h>
int extended_gcd(int a,int b,int &x,int &y)
{
    int r,t;
    if(!b)
    {
        x = 1;
        y = 0;
        return a;
    }
    r = extended_gcd(b,a%b,x,y);
    t = x;
    x = y;
    y = t-a/b*y;
    return r;
}
int main()
{
    int a,b,x,y,z;
    scanf("%d%d",&a,&b);
    z = extended_gcd(a,b,x,y);
    printf("%d%d%d\n",z,x,y);
    return 0;
}