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Factorial Trailing Zeroes
1 class Solution { 2 public: 3 int trailingZeroes(int n) { 4 int ret = 0; 5 while(n) 6 { 7 ret += n/5; 8 ...
分类:其他好文   时间:2015-06-09 11:22:39    阅读次数:137
LeetCode172:Factorial Trailing Zeroes
Given an integer n, return the number of trailing zeroes in n!.Note: Your solution should be in logarithmic time complexity.这道题需要在对数时间内求解阶乘中尾端0的个数。阶乘中0的个数是由各项因子中2和5的个数决定的,又由于阶乘是连续n的数的积,所以2的数目比5的数目多,故0的...
分类:其他好文   时间:2015-06-07 15:53:47    阅读次数:88
Java for LeetCode 172 Factorial Trailing Zeroes
Given an integer n, return the number of trailing zeroes in n!.Note: Your solution should be in logarithmic time complexity.解题思路:计算n能达到的5的最大次幂,算出在这种情况...
分类:编程语言   时间:2015-06-06 07:56:09    阅读次数:203
Project Euler:Problem 34 Digit factorials
145 is a curious number, as 1! + 4! + 5! = 1 + 24 + 120 = 145. Find the sum of all numbers which are equal to the sum of the factorial of their digits. Note: as 1! = 1 and 2! = 2 are not sums they...
分类:其他好文   时间:2015-06-03 15:53:03    阅读次数:112
Project Euler:Problem 34 Digit factorials
145 is a curious number, as 1! + 4! + 5! = 1 + 24 + 120 = 145. Find the sum of all numbers which are equal to the sum of the factorial of their digits. Note: as 1! = 1 and 2! = 2 are not sums they...
分类:其他好文   时间:2015-06-03 11:54:13    阅读次数:103
UVa 884 - Factorial Factors
题目:输出n!中素数因数的个数。分析:数论。这里使用欧拉筛法计算素数,在计算过程中求解就可以。 传统筛法是利用每一个素数,筛掉自己的整数倍; 欧拉筛法是利用当前计算出的全部素数,乘以当前数字筛数; 所以每一个前驱的素椅子个数一定比当前数的素因子个数少一个。说明:重新用了...
分类:其他好文   时间:2015-06-02 12:39:51    阅读次数:114
Project Euler:Problem 20 Factorial digit sum
n! means n × (n ? 1) × ... × 3 × 2 × 1 For example, 10! = 10 × 9 × ... × 3 × 2 × 1 = 3628800, and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27. Find the sum of the digi...
分类:其他好文   时间:2015-05-31 15:22:58    阅读次数:131
javascript之Arguments
一、Arguments.callee //获取当前正在执行的函数,也就是这个函数自身,常用于获取匿名函数自身 语法:arguments.callee var factorial = function (x) { if (x " + fun2()); //...
分类:编程语言   时间:2015-05-30 19:49:08    阅读次数:162
zoj 3621 Factorial Problem in Base K 数论 s!后的0个数
Factorial Problem in Base KTime Limit: 20 SecMemory Limit: 256 MB题目连接http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3621DescriptionHow m...
分类:其他好文   时间:2015-05-30 11:53:05    阅读次数:115
poj 1517 u Calculate e
没说的,水 #include #include using namespace std; int factorial(int n) { if(n==1||n==0) return 1; else return n*factorial(n-1); } int main() { cout<<"n e"<<endl; cout<<"...
分类:其他好文   时间:2015-05-28 12:39:03    阅读次数:185
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