hdu1576A/B

 1 //Accepted    228 KB    0 ms    
 2 #include <cstdio>
 3 #include <cstring>
 4 const int pp = 9973;
 5 int extend_euclid(int a,int b,int &x,int &y)
 6 {
 7     if (b==0)
 8     {
 9         x=1;
10         y=0;
11         return a;
12     }
13     int d=extend_euclid(b,a%b,x,y);
14     int t=x;
15     x=y;
16     y=t-a/b*y;
17     return d;
18 }
19 int A,B;
20 int a,b,x,y;
21 void slove()
22 {
23     a=B;
24     b=pp;
25     extend_euclid(a,b,x,y);
26     x=(x%b+b)%b;
27     int ans=A*x%pp;
28     printf("%d\n",ans);
29 }
30 int main()
31 {
32     int T;
33     scanf("%d",&T);
34     while (T--)
35     {
36         scanf("%d%d",&A,&B);
37         slove();
38     }
39     return 0;
40 }