HDU 2669 Romantic (扩展欧几里得定理)

转载请注明出处：忆梦http://blog.csdn.net/yimeng2013/article/details/11822563

#include<cstdio>
int x, y;
int gcd(int a,int b)
{// x,y用全局变量保存
int t,d;
if(b==0)
{
x=1;
y=0;
return a;
}
d=gcd(b,a%b);
t=x;
x=y;
y=t-(a/b)*y;
return d;
}

int main ()
{
int a, b;
while(~scanf("%d %d", &a, &b))
{
int d = gcd(a, b);
if(d != 1)
{
printf("sorry\n");
continue;
}

while(x <= 0)
{
x = x + b;
y = y - a;
}
printf("%d %d\n",x, y);
}
return 0;
}