HDU 2669 Romantic

Problem 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.

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【题目分析】
前半段浪漫温馨，后半段真是。。。。
很裸的一道拓展欧几里得的题目。然后注意要把x变为最小的一个正数。

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【代码】

#include <cstdio>inline int exgcd(int a,int b,int &x,int &y){       if (!b) {x=1,y=0;return a;}       int g=exgcd(b,a%b,x,y);       int t=x; x=y; y=t-a/b*y; return g;}int main(){    int a,b,x,y;    while (~scanf("%d%d",&a,&b))    {          int g=exgcd(a,b,x,y);          if (1%g) printf("sorry\n");          else           {while (x<0) x+=b,y-=a; printf("%d %d\n",x,y);}    }}