Almost All Divisors（求因子个数及思维）

【Almost All Divisors（求因子个数及思维）】的更多相关文章

Almost All Divisors（求因子个数及思维）

---恢复内容开始--- We guessed some integer number xx. You are given a list of almost all its divisors. Almost all means that there are all divisors except 11and xx in the list. Your task is to find the minimum possible integer xx that can be the guessed nu…

Trailing Zeroes (I) LightOJ - 1028（求因子个数）

题意: 给出一个N 求N有多少个别的进制的数有后导零解析: 对于一个别的进制的数要转化为10进制 (我们暂且只分析二进制就好啦) An * 2^(n-1) + An-1 * 2^(n-2) + ``````+ A1 * 2^1 + A0 * 2^0 = N 因为有后导零我们暂且只看有一个后导零的情况即A0 = 0 那么 2 * ( An * 2^(n-2) + An01 * 2^(n-3) + `````` + A1) = N 即 An * 2^(n-2) + An-1 * 2…

POJ 2992 Divisors （求因子个数）

题意:给n和k,求组合C(n,k)的因子个数. 这道题,若一开始先预处理出C[i][j]的大小,再按普通方法枚举2~sqrt(C[i][j])来求解对应的因子个数,会TLE.所以得用别的方法. 在说方法前,先说一个n!的性质:n!的素因子分解中的素数p的个数为n/p+n/(p^2)+...+n/(p^k)+... <ACM-ICPC程序设计系列数论及应用>上的方法,200+ms:首先先求解435以内的素因子.然后预处理出j!中每个素因子的个数,公式如下:num[j][i]=j/prime[i…

LightOj1028 - Trailing Zeroes (I)---求因子个数

题目链接:http://lightoj.com/volume_showproblem.php?problem=1028 题意:给你一个数 n (1<=n<=10^12), 然后我们可以把它转化为k(k>=2)进制的数,但是要满足转化之后的数的最后一位是0,求这样的k共有多少个其实就是求n的大于1的因子有多少个; 一个数n可以写成 n = p1^a1 * p2^a2 * p3^a3 * ... pk^ak(其中pi是n的素因子)那么n的所有因子个数根据乘法原理就是(a1+1)*(a2+1…

Easy Number Challenge(暴力，求因子个数)

Easy Number Challenge Time Limit:2000MS Memory Limit:262144KB 64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 236B Appoint description: System Crawler (2016-04-26) Description Let's denote d(n) as the number of divisors of a…

HDU-1492-The number of divisors(约数) about Humble Numbers -求因子总数+唯一分解定理的变形

A number whose only prime factors are 2,3,5 or 7 is called a humble number. The sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 25, 27, ... shows the first 20 humble numbers. Now given a humble number, please write a program t…

Divisors (求解组合数因子个数)【唯一分解定理】

Divisors 题目链接(点击) Your task in this problem is to determine the number of divisors of Cnk. Just for fun -- or do you need any special reason for such a useful computation? Input The input consists of several instances. Each instance consists of a sin…