zoukankan      html  css  js  c++  java
  • 2015 HUAS Summer Trainning #6~I

    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
     
     解题思路:这个问题我本来是用公式将y求出来然后看它是不是整数,虽然答案对了,但是提交总是超时。所以看了书上的扩展欧几里德算法之后才有了一点眉目。
    程序代码:
    #include<iostream>
    #include<cstring>
    #include<cstdio>
    using namespace std;
    long long gcd(long long a,long long b,long long &x,long long &y)
    {
    
        if(b==0)  {
            x=1;y=0;
            return a;
        }
        else{
        long long d=gcd(b,a%b,x,y);
        long long temp=x;
        x=y;
        y=temp-a/b*y;
        return d;
        }
    
    }
    int main()
    {
    
        long long x,y,a,b;
        while(cin>>a>>b)
        {
            long long ans=gcd(a,b,x,y);
            if(1%ans)
                printf("sorry
    ");
            else{
                while(x<0)
                    x+=b,y-=a;
                printf("%d %d
    ",x,y);
            }
    
    
        }
        return 0;
    }
  • 相关阅读:
    随机数测试
    往xml中更新节点
    Spring学习之代理
    SpringMVC基本配置
    Hibernate映射一对一关联关系
    成员变量的定义与使用
    面向对象三大特性
    请用心“品尝”网络电视精灵
    汽车租赁系统
    JSP 甜点
  • 原文地址:https://www.cnblogs.com/chenchunhui/p/4741194.html
Copyright © 2011-2022 走看看