题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2669
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.
Each case two nonnegative integer a,b (0<a, b<=2^31)
PS:
扩展欧几里德模板题。
附:扩展欧几里德解说:javascript:void(0)
代码例如以下:
#include <cstdio> #include <cstring> #include <cmath> typedef __int64 LL; LL exgcd(LL a,LL b,LL &x,LL &y) { if(b == 0) { x = 1; y = 0; return a; } LL r = exgcd(b,a%b,x,y); LL t = x; x = y; y = t-a/b*y; return r; } int main() { LL a,b,x,y; while(scanf("%I64d%I64d",&a,&b)!=EOF) { LL d = exgcd(a,b,x,y); if(1%d)//不能整除 printf("sorry\n"); else { while(x<0) x+=b,y-=a; printf("%I64d %I64d\n",x,y); } } return 0; }