6322.Problem D. Euler Function 题意就是找欧拉函数为合数的第n个数是什么. 欧拉函数从1到50打个表,发现规律,然后勇敢的水一下就过了. 官方题解: 代码: //1004-欧拉函数水题 #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<cmath> using namespace std; typede…

链接:http://acm.hdu.edu.cn/showproblem.php?pid=6322 Problem Description In number theory, Euler's totient function φ(n) counts the positive integers up to a given integer n that are relatively prime to n . It can be defined more formally as the number…

链接:http://acm.hdu.edu.cn/showproblem.php?pid=6331 Walking Plan  Problem Description There are n intersections in Bytetown, connected with m one way streets. Little Q likes sport walking very much, he plans to walk for q days. On the i -th day, Little…

链接:http://acm.hdu.edu.cn/showproblem.php?pid=6325                                   Interstellar Travel Problem Description After trying hard for many years, Little Q has finally received an astronaut license. To celebrate the fact, he intends to buy…

Chiaki often participates in international competitive programming contests. The time zone becomes a big problem.  Given a time in Beijing time (UTC +8), Chiaki would like to know the time in another time zone ss. Input There are multiple test cases.…

Little Q and Little T are playing a game on a tree. There are n vertices on the tree, labeled by 1,2,...,n , connected by n−1 bidirectional edges. The i -th vertex has the value of wi .In this game, Little Q needs to grab some vertices on the tree. H…

hiaki has an array of nn positive integers. You are told some facts about the array: for every two elements aiai and ajaj in the subarray al..ral..r (l≤i<j≤rl≤i<j≤r), ai≠ajai≠aj holds.  Chiaki would like to find a lexicographically minimal array whi…

Chiaki has 3n3n points p1,p2,-,p3np1,p2,-,p3n. It is guaranteed that no three points are collinear.  Chiaki would like to construct nn disjoint triangles where each vertex comes from the 3n3n points. Input There are multiple test cases. The first lin…

Given an integer nn, Chiaki would like to find three positive integers xx, yy and zzsuch that: n=x+y+zn=x+y+z, x∣nx∣n, y∣ny∣n, z∣nz∣n and xyzxyz is maximum. Input There are multiple test cases. The first line of input contains an integer TT (1≤T≤1061…

//题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=6322 //题目大意:给定 k,求第 k 小的数 n,满足 φ(n) 是合数.显然 φ(1) = 1 不是合数,只考虑 n ≥ 2 的情况.//思路:得到题意之后,查到了一张表(https://en.wikipedia.org/wiki/Euler%27s_totient_function)//得知当且仅当 n = 1, 2, 3, 4, 6 时,φ(n) 不是合数.第1小的K值是5,第二小的K值…

◇第一站◇ 2018HDU多校赛 十场多校赛下来,也算是给一个初中生开了眼界……看着清华一次次AK(默默立下flag),看着自己被同校的高中生完虐,一个蒟蒻只能给dalao们垫脚…

HDU6578 2019HDU多校训练赛第一场 1001 (dp) 传送门:http://acm.hdu.edu.cn/showproblem.php?pid=6578 题意: 你有n个空需要去填,有m个限制,每次限制要求在区间[l,r]内不同的点的个数是为x个,问你填完这n个空的并且满足限制的方案数 题解: 定义\(dp[i][j][k][t]\)表示在区间填完前t个位置后,{0,1,2,3}这四个数字最后一次出现的位置为i,j,k,t的方案数 滚动数组优化掉第一维后,我们转移如下 dp[p]…

HDU6579 2019HDU多校训练赛第一场1002 (线性基) 传送门:http://acm.hdu.edu.cn/showproblem.php?pid=6579 题意: 两种操作 1.在序列末尾添加一个数 2.查询区间异或最大值 强制在线 题解: 暴力的做法可以用数据结构维护区间线性基,但肯定过不了. 贪心地维护序列的前缀线性基 (上三角形态),对于每个线性基,将出现位置靠右的数 字尽可能地放在高位,也就是说在插入新数字的时候,要同时记录对应位置上数字的出现位 置,并且在找到可以插入的位…

HDU6621 K-th Closest Distance HDU2019多校训练第四场 1008(主席树+二分) 传送门:http://acm.hdu.edu.cn/showproblem.php?pid=6621 题意: 给你n个数,有m次询问 每次问你在区间[l,r]内 第k小的|\(a_i-p\)|是多少 题解: 主席树+二分 每次二分答案 如果p+mid到p-mid的值的个数大于k个的话,mid值就是可行了,然后缩小区间往左找即可 因为保证有解,所以二分出来的mid值就是答案了 que…

The Euler functionTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 6018 Accepted Submission(s): 2539 Problem DescriptionThe Euler function phi is an important kind of function in number theory, (n)…

The Euler function Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5028    Accepted Submission(s): 2123 Problem Description The Euler function phi is an important kind of function in number theo…

The Euler function Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 32768/32768K (Java/Other) Total Submission(s) : 39   Accepted Submission(s) : 19 Font: Times New Roman | Verdana | Georgia Font Size: ← → Problem Description The Euler function…

/* 题意:(n)表示小于n与n互质的数有多少个,给你两个数a,b让你计算a+(a+1)+(a+2)+......+b; 初步思路:暴力搞一下,打表 #放弃:打了十几分钟没打完 #改进:欧拉函数:具体证明看po主的博客 ^0^ #超时:这里直接用欧拉函数暴力搞还是不可以的,用到线性筛欧拉函数,这里总和爆int,要用long long */ #include<bits/stdc++.h> #define ll long long using namespace std; /***********…

The Euler function Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Problem Description The Euler function phi is an important kind of function in number theory, (n) represents the amount of the numbers which are sm…

The Euler function Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2986    Accepted Submission(s): 1221 Problem Description The Euler function phi is an important kind of function in number theo…

版权声明:本文为博主原创文章,未经博主同意不得转载. vasttian https://blog.csdn.net/u012860063/article/details/36426357 题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2824 欧拉函数性质: 1:(百科):http://baike.baidu.com/link?url=r-yneKCCyS9N6bhbQCqiZX0V2OCYq9r7iHSzHTSs03H7qRvu1OfUzlOxf…

The Euler function Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3284    Accepted Submission(s): 1350 Problem Description The Euler function phi is an important kind of function in number theo…

The Euler function Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4507    Accepted Submission(s): 1872     Problem Description The Euler function phi is an important kind of function in number…

The Euler function Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4518    Accepted Submission(s): 1879 Problem Description The Euler function phi is an important kind of function in number the…

题目: The Euler function Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 166 Accepted Submission(s): 96   Problem Description The Euler function phi is an important kind of function in number theory…

http://acm.hdu.edu.cn/showproblem.php?pid=2824 Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 7752    Accepted Submission(s): 3217 Problem Description The Euler function phi is an important kin…

题目链接:hdu 2824 The Euler function 题意: 让你求一段区间的欧拉函数值. 题解: 直接上板子. 推导过程: 定义:对于正整数n,φ(n)是小于或等于n的正整数中,与n互质的数的数目. 例如:φ(8)=4,因为1,3,5,7均和8互质. 性质:1.若p是质数,φ(p)= p-1. 2.若n是质数p的k次幂,φ(n)=(p-1)*p^(k-1).因为除了p的倍数都与n互质 3.欧拉函数是积性函数,若m,n互质,φ(mn)= φ(m)φ(n). 根据这3条性质我们就可以推…

Time Limit: 1000MS   Memory Limit: 32768KB   64bit IO Format: %I64d & %I64u Description The Euler function phi is an important kind of function in number theory, (n) represents the amount of the numbers which are smaller than n and coprime to n, and…

The Euler function phi is an important kind of function in number theory, (n) represents the amount of the numbers which are smaller than n and coprime to n, and this function has a lot of beautiful characteristics. Here comes a very easy question: s…

题目链接:http://acm.zzuli.edu.cn/zzuliacm/problem.php?id=1908 题意:如果'.'被'*'围起来,就把'.'变为'*'. 分析:如果是'*'直接输出,如果是'.' 则要对其搜索 如果四个方向都是封闭的,则可以改变.即w[i][j]=4; 如果查询的是'*'或者查询的是已被查询过的'.'  ,则记录上: 如果查询的是'.'而且没有查询标记过,则进行查询: #include<iostream> #include<algorithm> #…