学步园

赤裸裸的扩展GCD。。。

#include <cstdio>
#include <cstring>
#include <cstring>
using namespace std;
typedef long long LL;
LL Gcd(LL a,LL b){
    LL r = a % b;
    while(r){
        a = b;
        b = r;
        r = a % b;
    }
    return b;
}
void Ex_Gcd(LL a,LL b,LL &x,LL &y){
    if(!b){
        x = 1;
        y = 0;
        return ;
    }
    Ex_Gcd(b,a % b, x,y);
    LL temp = x;
    x = y;
    y = temp - a / b * y;
    return ;
}
int main(){
    LL a,b;
    while(~scanf("%I64d%I64d",&a,&b)){
        LL d = Gcd(a,b);
        if(d != 1) printf("sorry\n");
        else{
            LL x,y;
            Ex_Gcd(a,b,x,y);
            LL x1 = x % b;
            while(x1 <= 0){
                if(b < 0) x1 -=b;
                else x1 += b;
            }
            LL t = (x1 - x) /b;
            y -= a * t;
            printf("%I64d %I64d\n",x1,y);
        }
    }
    return 0;
}