HDU2669 Romantic

Description

The Sky is Sprite.
The Birds is Fly in the Sky.

The Wind is Wonderful.

Blew Throw the Trees
Trees are Shaking, Leaves are Falling.

Lovers Walk passing, and so are You.

................................Write in English class by yifenfei

Girls are clever and bright. In HDU every girl like math. Every girl like to solve math problem!

Now tell you two nonnegative integer a and b. Find the
nonnegative integer X and integer Y to satisfy X*a + Y*b = 1. If no such
answer print "sorry" instead.

Input

The input contains multiple test cases.

Each case two nonnegative integer a,b (0<a, b<=2^31)

Output

output nonnegative integer X and integer Y, if there are more answers
than the X smaller one will be choosed. If no answer put "sorry"
instead.

Sample Input

77 51
10 44
34 79

Sample Output

2 -3
sorry
7 -3

裸的扩展欧几里得

 1 #include<iostream>
 2 #include<cstdio>
 3 #include<algorithm>
 4 #include<cstring>
 5 #include<cmath>
 6 using namespace std;
 7 int exgcd(int a,int b,int &x,int &y){
 8     if(b==0){
 9         x=1;y=0;
10         return a;
11     }
12     int res=exgcd(b,a%b,x,y);
13     int t=x;x=y;y=t-a/b*y;
14     return res;
15 }
16 int main(){
17     int a,b,x,y;
18     while(scanf("%d%d",&a,&b)!=EOF)
19     {
20         int g=exgcd(a,b,x,y);
21         if(1%g)
22             printf("sorry\n");
23         else{
24             while(x<0){x+=b;y-=a;}
25             printf("%d %d\n",x,y);
26         }
27     }
28     return 0;
29 }