【Heaven Cow与God Bull】题解

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【Heaven Cow与God Bull】题解

题目 Description __int64 ago,there's a heaven cow called sjy... A god bull named wzc fell in love with her... As an OI & MOer,wzc gave sjy a quesiton... 给定一个整数n,求一个整数m,满足m<=n,并且m/phi(m)的值最大. 注:phi(m)代表m的欧拉函数,即不大于m且与m互质的数的个数. Input 第一行是一个整数T,表示该测试点有T组…

bzoj3034: Heaven Cow与God Bull

Description __int64 ago,there's a heaven cow called sjy...A god bull named wzc fell in love with her...As an OI & MOer,wzc gave sjy a quesiton... 给定一个整数n,求一个整数m,满足m<=n,并且m/phi(m)的值最大.注:phi(m)代表m的欧拉函数,即不大于m且与m互质的数的个数. Input 第一行是一个整数T,表示该测试点有T组数据.接下来…

「Poetize3」Heaven Cow与God Bull

描述 Description 给定一个整数n,求一个整数m,满足m<=n,并且m/phi(m)的值最大.注:phi(m)代表m的欧拉函数,即不大于m且与m互质的数的个数. 题解:m/phi(m) 很容易化成连积(p/(p-1)) p|m所以就很简单了,将最小的质数乘起来,直到>n,输出前一个.因为保证最小所以只乘一次,因为p/(p-1)单调减,所以从小的开始选.高精度写错搞了好久,然后有卡了几次时才过了代码: #include<cstdio> #include<cstdl…

ACM-ICPC 2018 沈阳赛区网络预赛 Made In Heaven（K短路）题解

思路:K短路裸题代码: #include<queue> #include<cstring> #include<set> #include<map> #include<stack> #include<string> #include<cmath> #include<vector> #include<cstdio> #include<iostream> #include<algori…

tyvj 1934 高精度

「Poetize3」Heaven Cow与God Bull From wwwwodddd 背景 Background __int64 ago,there's a heaven cow called sjy...A god bull named wzc fell in love with her...As an OI & MOer,wzc gave sjy a quesiton... 描述 Description 给定一个整数n,求一个整数m,满足m<=n,并且m/phi(m)…

bzoj AC倒序

Search GO 说明:输入题号直接进入相应题目,如需搜索含数字的题目,请在关键词前加单引号 Problem ID Title Source AC Submit Y 1000 A+B Problem 10983 18765 Y 1036 [ZJOI2008]树的统计Count 5293 13132 Y 1588 [HNOI2002]营业额统计 5056 13607 1001 [BeiJing2006]狼抓兔子 4526 18386 Y 2002 [Hnoi2010]Bounce 弹飞绵羊 43…