Write an algorithm which computes the number of trailing zeros in n factorial. Have you met this question in a real interview? Yes Example 11! = 39916800, so the out should be 2 /* * param n: As desciption * return: An integer, denote the number of t…

题目: 尾部的零 设计一个算法,计算出n阶乘中尾部零的个数 样例 11! = 39916800,因此应该返回 2 挑战 O(logN)的时间复杂度 解题: 常用方法: 也许你在编程之美中看到,通过求能够被2 整除和能够被5整除个数的最小值就是答案,或者直接求能够被5整除的个数就是答案<能够被5整除的数显然比较小>,但是在这里,java python都试了,结果都会出现运行超时或者越界的问题. 维基百科中有如下计算方法: Java程序: class Solution { /* * param n…

Well, to compute the number of trailing zeros, we need to first think clear about what will generate a trailing 0? Obviously, a number multiplied by 10 will have a trailing 0 added to it. So we only need to find out how many 10's will appear in the e…

2. Trailing Zeros[easy] Write an algorithm which computes the number of trailing zeros in n factorial. Have you met this question in a real interview? Yes Example 11! = 39916800, so the out should be 2 Challenge O(log N) time 解法一: class Solution { /*…

Description Write an algorithm which computes the number of trailing zeros in n factorial. Example 11! = 39916800, so the out should be 2 Challenge O(log N) time Answer /* * @param n: A long integer * @return: An integer, denote the number of trailin…

问题描述: Write a program that will calculate the number of trailing zeros in a factorial of a given number. N! = 1 * 2 * 3 * ... * N Be careful 1000! has 2568 digits... For more info, see: http://mathworld.wolfram.com/Factorial.html Examples zeros(6) =…

LeetCode上的原题,讲解请参见我之前的博客Factorial Trailing Zeroes. 解法一: int trailing_zeros(int n) { ; while (n) { res += n / ; n /= ; } return res; } 解法二: int trailing_zeros(int n) { ? : n / + trailing_zeros(n / ); } CareerCup All in One 题目汇总…

Write an algorithm which computes the number of trailing zeros in n factorial. Have you met this question in a real interview? Yes Example 11! = 39916800, so the out should be 2 Challenge O(log N) time LeetCode上的原题,请参见我之前的博客Factorial Trailing Zeroes.…

题目: Given an integer n, return the number of trailing zeroes in n!. Note: Your solution should be in logarithmic time complexity. 思路: 题意是要求一个数字的阶乘,末尾有多少个0 要求是对数级别的时间,所以考虑用递归 分析一下,产生一个10,后面加0,找到所有的2*5,或者2的次方×5的次方,任何情况下因子2的个数永远大于5 所以只需要计算因子5的个数,(25*4 =…

Rotate Array 本题目收获: 题目: Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4]. 思路: 我的思路:新建一个数组存放旋转后的内容,但是怎么把原数组的内容存放在数组中,不清楚. leetcode/discuss思路: 思路一:新建数组,复制原…

任意门:http://codeforces.com/contest/1114/problem/C C. Trailing Loves (or L'oeufs?) time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output The number "zero" is called "love" (or "…

The number "zero" is called "love" (or "l'oeuf" to be precise, literally means "egg" in French), for example when denoting the zero score in a game of tennis. Aki is fond of numbers, especially those with trailing z…

我在网上看到了一点神奇的代码,用来计算一个数字末尾连续零的个数. 刚好我在优化一个I2C读写函数(只写入I2C特定bit),觉得这个很有用.经过尝试,确实没问题. 下面我隆重介绍一下: Count the consecutive zero bits (trailing) on the right with multiply and lookup unsigned int v; // find the number of trailing zeros in 32-bit v int r; // r…

Yet Another Source Code for LintCode Current Status : 232AC / 289ALL in Language C++, Up to date (2016-02-10) For more problems and solutions, you can see my LintCode repository. I'll keep updating for full summary and better solutions. See cnblogs t…

备份文件时看到的.我以前居然下过这东西. 2016-12-4 12:05:52更新 纯文本格式真棒.假如使用word写的我能拷过来格式还不乱?? Markdown真好. Bit Hacks By Sean Eron Anderson seander@cs.stanford.edu Converted to Markdown by Joe Gibson (@gibsjose) joseph.gibson@nasa.gov Edits and Table of Contents by Jeroen…

B1024. 科学计数法 (20) Description: 科学计数法是科学家用来表示很大或很小的数字的一种方便的方法,其满足正则表达式[+-][1-9]"."[0-9]+E[+-][0-9]+,即数字的整数部分只有1位,小数部分至少有1位,该数字及其指数部分的正负号即使对正数也必定明确给出. 现以科学计数法的格式给出实数A,请编写程序按普通数字表示法输出A,并保证所有有效位都被保留. Input: 每个输入包含1个测试用例,即一个以科学计数法表示的实数A.该数字的存储长度不超过99…

Exponentiation Time Limit: 500MS   Memory Limit: 10000K Total Submissions: 162918   Accepted: 39554 Description Problems involving the computation of exact values of very large magnitude and precision are common. For example, the computation of the n…

Exponentiation Time Limit: 500MS   Memory Limit: 10000K Total Submissions: 145642   Accepted: 35529 Description Problems involving the computation of exact values of very large magnitude and precision are common. For example, the computation of the n…

Go to the first, previous, next, last section, table of contents. Printing Output One of the most common actions is to print, or output, some or all of the input. You use the print statement for simple output. You use the printf statement for fancier…

Description Problems involving the computation of exact values of very large magnitude and precision are common. For example, the computation of the national debt is a taxing experience for many computer systems.     This problem requires that you wr…

Octal Fractions Time Limit: 1 Sec  Memory Limit: 64 MBSubmit: 149  Solved: 98 Description Fractions in octal (base 8) notation can be expressed exactly in decimal notation. For example, 0.75 in octal is 0.963125 (7/8 + 5/64) in decimal. All octal num…

Octal Fractions Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 6669   Accepted: 3641 Description Fractions in octal (base 8) notation can be expressed exactly in decimal notation. For example, 0.75 in octal is 0.953125 (7/8 + 5/64) in d…

在JavaScript中输出下面这些数值(注意不能作为字符串输出):0.1000000000000000000000000001(28位小数).0.100000000000000000000000001(27位小数).0.1000000000000000000000000456(28位小数).0.09999999999999999999999(23位小数),显示出来的结果都是数值0.1.又如,如果输出1/3的有理数表达式,结果是0.3333333333333333. document.write…

Exponentiation Time Limit: 2000/500 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 9107    Accepted Submission(s): 2654 Problem Description Problems involving the computation of exact values of very large magnitude…

Problem Reason Reference Moving ZeroesSort Colors Corner cases   Shortest Word Distance Thought: 2 ptr chasing   Merge 2 sorted ListsRemove Linked List Elem Corner cases   Power of Four Thought: fun bit ops   Pow(x, n) int overflow   Rectangle Area T…

Description Problems involving the computation of exact values of very large magnitude and precision are common. For example, the computation of the national debt is a taxing experience for many computer systems. This problem requires that you write…

A. Pineapple Incident time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Ted has a pineapple. This pineapple is able to bark like a bulldog! At time t (in seconds) it barks for the first time.…

We have a sequence of N positive integers: a[0] through a[N-1]. You do not know these integers. All you know is the number of trailing zeros in their binary representations. You are given a vector <int> d with N elements. For each i, d[i] is the num…

http://www.matrix67.com/blog/archives/3985 神秘常量复出!用0x077CB531计算末尾0的个数 大家或许还记得 Quake III 里面的一段有如天书般的代码,其中用到的神秘常量 0x5F3759DF 究竟是怎么一回事,着实让不少人伤透了脑筋.今天,我见到了一段同样诡异的代码.下面这个位运算小技巧可以迅速给出一个数的二进制表达中末尾有多少个 0 .比如, 123 456 的二进制表达是 1 11100010 01000000 ,因此这个程序给出的结果就…

http://graphics.stanford.edu/~seander/bithacks.html Bit Twiddling Hacks By Sean Eron Andersonseander@cs.stanford.edu Individually, the code snippets here are in the public domain (unless otherwise noted) — feel free to use them however you please. Th…