CF 7C. Line(扩展欧几里德)

题目链接

AC了。经典问题，a*x+b*y+c = 0整数点，有些忘记了扩展欧几里德，复习一下。

 1 #include <cstdio>
 2 #include <iostream>
 3 #include <cmath>
 4 using namespace std ;
 5 #define LL __int64
 6 LL x,y;
 7 LL ext_eulid(LL a,LL b)
 8 {
 9     LL t,d;
10     if(b == 0)
11     {
12         x = 1;
13         y = 0;
14         return a;
15     }
16     d = ext_eulid(b,a%b);
17     t = x;
18     x = y;
19     y = t - (a/b)*y;
20     return d;
21 }
22 int main()
23 {
24     LL A,B,C,d;
25     cin>>A>>B>>C;
26     d = ext_eulid(A,B);
27     if((-C)%d != 0)
28     {
29         printf("-1\n");
30     }
31     else
32     {
33         x = x*((-C)/d);
34         y = y*((-C)/d);
35         cout<<x<<" "<<y<<endl;
36     }
37     return 0;
38 }

 

posted @ 2013-10-19 11:08  Naix_x  阅读(219)  评论(0)  编辑  收藏  举报