HDU 2669 Romantic

#include<stdio.h>
int exgcd(int a,int b,int &x,int &y) 
{
	int i,j;
	if(b==0)
	{
		x=1;
		y=0;
		return a;
	}
	i=exgcd(b,a%b,x,y);
	j=x;
	x=y;
	y=j-a/b*y;
	return i;
}
int main()
{
	int a,b,x,y,r;
	while(scanf("%d %d",&a,&b)!=EOF)
	{
	    r=exgcd(a,b,x,y);
		if(r==1)
		{
			while(x<0)
			{
				x+=b;
				y-=a;
			}
			printf("%d %d\n",x,y);
		}
		else
			printf("sorry\n");
	}
	return 0;
}