http://codeforces.com/contest/397/problem/C 给出n个数字,m = a[1] * a[2] * a[3] ... * a[n] 要求把m分成n个不一样的乘积,求方案数. 就是35分成2分的话,1 * 35 .35 * 1.5 * 7.7 * 5 首先数字很大,表示出来是不可能的. 考虑储存它的质因数,例如12. 12 = 2 * 2 * 3 如果要分成4分的话,首先对每一种质因数放. 例如2,有2个,可以表示为(4份) 2 * 2 * 1 * 1 2 *…

Portal Description 给出\(n(n\leq500)\)个\([1,10^9]\)的数,令\(m=\prod_{i=1}^n a_i\).求有多少个有序排列\(\{a_n\}\),使得\(\prod_{i=1}^n a_i=m\).答案\(mod \ 10^9+7\):两个有序排列不同当且仅当\(\exists i,a_i \neq b_i\). Solution 将\(m\)分解质因数,即\(m=\prod_{i=1}^t p_i^{k_i}\). 将\(m\)分配到\(n\)…

题意:给你n个数,然后把这个n个数的乘积化成n个数相乘,可以化成多少个. 思路:分解质因数,求出每一个质因子的个数,然后用组合数学中隔板法把这些质因子分成n分,答案就是所有质因子划分成n份的情况的乘积. #include <cstdio> #include <cstring> #include <map> #include <algorithm> #define maxn 100100 #define ll long long using namespace…

这次运气比较好,做出两题.本来是冲着第3题可以cdq分治做的,却没想出来,明天再想好了. A. On Number of Decompositions into Multipliers 题意:n个数a1,a2, a3...an求n个数相乘与a1*a2*a3*a4...an相等的排列个数. 分析:首先应该对ai分解质因数,求出所有ai中质因数及个数,枚举排列中每个数包含的质因数个数,例如质因数qi,有ni个,相应的排列中数包含质因数qi个数设为x1,x2,....xn, x1+x2+x3..+xn…

A. On Number of Decompositions into Multipliers 题目连接:http://codeforces.com/contest/396/problem/A 大意:给定n(n<=500)个数ai(1<=ai<=10^9),得到他们的乘积m,问将m分解成n个数相乘,有多少种方法. 思路:显然每个质因数都是独立的,如果质因数pi出现了ci次,那么把它分到n个数中,就有C(ci+n-1,n-1)种方法,然后把所有因数的答案相乘就是结果.于是我们可以先预处理出…

C. On Number of Decompositions into Multipliers time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given an integer m as a product of integers a1, a2, ... an . Your task is to find the…

Round Numbers DescriptionThe cows, as you know, have no fingers or thumbs and thus are unable to play Scissors, Paper, Stone' (also known as 'Rock, Paper, Scissors', 'Ro, Sham, Bo', and a host of other names) in order to make arbitrary decisions such…

题目地址:http://poj.org/problem?id=1019 Number Sequence Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 35680   Accepted: 10287 Description A single positive integer i is given. Write a program to find the digit located in the position i in…

题目: Round Numbers Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 8492   Accepted: 2963 Description The cows, as you know, have no fingers or thumbs and thus are unable to play Scissors, Paper, Stone' (also known as 'Rock, Paper, Scissor…

链接:https://ac.nowcoder.com/acm/contest/897/J 来源:牛客网 Binary Number 时间限制:C/C++ 1秒,其他语言2秒 空间限制:C/C++ 32768K,其他语言65536K 64bit IO Format: %lld 题目描述 As a programmer, you are probably familiar with the binary representation of integers. That is, write an in…