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  • 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
    ");
    23         else{
    24             while(x<0){x+=b;y-=a;}
    25             printf("%d %d
    ",x,y);
    26         }
    27     }
    28     return 0;
    29 }
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  • 原文地址:https://www.cnblogs.com/SilverNebula/p/5660901.html
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