X-factor Chains Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 7375 Accepted: 2340 Description Given a positive integer X, an X-factor chain of length m is a sequence of integers, 1 = X0, X1, X2, …, Xm = X satisfying Xi < Xi+1 and Xi …
题目链接:http://poj.org/problem?id=1845 关于质因数分解,模板见:http://www.cnblogs.com/atmacmer/p/5285810.html 二分法思想:选定一个要进行比较的目标,在区间[l,r]之间不断二分,直到取到与目标相等的值. #include<iostream> #include<cstdio> #include<cstring> using namespace std; typedef long long ll…
Smith Numbers Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 14521 Accepted: 4906 Description While skimming his phone directory in 1982, Albert Wilansky, a mathematician of Lehigh University,noticed tha…
id=1730">Perfect Pth Powers Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 16746 Accepted: 3799 Description We say that x is a perfect square if, for some integer b, x = b2.…
Prime Test Time Limit: 6000MS Memory Limit: 65536K Total Submissions: 35528 Accepted: 9479 Case Time Limit: 4000MS Description Given a big integer number, you are required to find out whether it's a prime number. Input The first line contains the…
def reduceNum(n): '''题目:将一个正整数分解质因数.例如:输入90,打印出90=2*3*3*5''' print '{} = '.format(n), : print 'Please input a valid number !' exit() elif n ] : print '{}'.format(n) ] : # 循环保证递归 , n + ) : : n /= index # let n equal to it n/index : # This is the point…
下面是四种用java语言编程实现的求最大公约数的方法: package gcd; import java.util.ArrayList; import java.util.List; public class gcd { public static void main(String[] args) { long startTime; long endTime; long durationTime; int[] testArray1 = new int[]{784, 988, 460, 732,…
题目链接:http://codeforces.com/gym/101981/attachments 题意: 令 $mul(l,r) = \prod_{i=l}^{r}a_i$,且 $fac(l,r)$ 代表 $mul(l,r)$ 的不同素因子个数.求 $\sum_{i=1}^{n}\sum_{j=i}^{n}fac(i,j)$. InputThe first line contains one integer n (1 \le n \le 10^6) — the length of the se…
题目:将一个正整数分解质因数.例如:输入90,打印出90=2*3*3*5. 将一个正整数分解质因数分析:对n进行分解质因数,找到最小的质数k如果这个质数恰好等于n则说明分解质因数过程已经结束,打印输出即可如果n<>k,但n能被k整除,则因打印k的值,并用n除以k的商,作为新的正整数n,重复2如果不能被k整除,则用k+1作为k的值 import java.util.*; public class Rabbit{ public static void main(String[] args){ Sy…
题目:将一个正整数分解质因数.例如:输入90,打印出90=2*3*3*5.分析:对n进行分解质因数,应先找到一个最小的质数k,然后按下述步骤完成:(1)如果这个质数恰等于n,则说明分解质因数的过程已经结束,打印出即可.(2)如果n<>k,但n能被k整除,则应打印出k的值,并用n除以k的商,作为新的正整数n,重复执行第一步.(3)如果n不能被k整除,则用k+1作为k的值,重复执行第一步. import java.util.*; public class Prog4 { public static…
