A number is called 'desirable' if all thedigits are strictly ascending eg: 159 as 1<5<9. You know that your rivalhas a strictly numeric password that is 'desirable'. Your close ally has givenyou the number of digits (N) in your rival's password. WAP…

Find the seed of a number. Eg : 1716 = 143*1*4*3 =1716 so 143 is the seed of 1716. find all possible seed for a given number. 辗转相除法,由性质可利用 sqrt(num) <= seed_number <= num/2 缩小范围. def seed_number(num) seed = Math.sqrt(num).to_i while seed <= num /…

Let the user enter a decimal number. Therange allowed is 0.0001 to 0.9999. Only four decimal places are allowed. Theoutput should be an irreducible fraction. E.g.: If the user enters 0.35,the irreducible fraction will be 7/20. 等于找与10000的公约数 def fract…

Epic Professor   Dr. Bahosain works as a professor of Computer Science at HU (Hadramout    University). After grading his programming exam, he noticed that most of the students have failed. Since this is the last semester for him teaching in Yemen, D…

传送门 E. Epic Fail of a Genie time limit per test 0.5 seconds memory limit per test 64 megabytes input standard input output standard output Aladdin had found a new shiny lamp and has started polishing it with his hands. Suddenly a mysterious genie app…

E. Epic Fail of a GenieTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100685/problem/E Description Aladdin had found a new shiny lamp and has started polishing it with his hands. Suddenly a mysterious genie appeared from withi…

14 down vote It's the other way round. Number of mappers is decided based on the number of splits. In reality it is the job of InputFormat, which you are using, to create the splits. You do not have any idea about the number of mappers until number o…

http://www.chami.com/tips/delphi/112696D.html Sometimes it's necessary to pass undefined number of [different type] variables to a function -- look at Format() function in Delphi and *printf() functions in C/C++ for example. Once you analyze the foll…

目录 1. Math 对象:数学对象,提供对数据的数学计算.如:获取绝对值.向上取整等.无构造函数,无法被初始化,只提供静态属性和方法. 2. Number 对象 :Js中提供数字的对象.包含整数.浮点数等等.并提供数字的类型转换.小数点截取等方法. 1. Math 对象 1.1 介绍 Math 对象,是数学对象,提供对数据的数学计算,如:获取绝对值.向上取整等.无构造函数,无法被初始化,只提供静态属性和方法. 1.2 构造函数 无 :Math 对象无构造函数,无法被初始化,只提供静态属性和方法…

题意:求f(n)=1/1+1/2+1/3+1/4-1/n   (1 ≤ n ≤ 108).,精确到10-8    (原题在文末) 知识点:      调和级数(即f(n))至今没有一个完全正确的公式,但欧拉给出过一个近似公式:(n很大时)       f(n)≈ln(n)+C+1/2*n       欧拉常数值:C≈0.57721566490153286060651209       c++ math库中,log即为ln. 题解: 公式:f(n)=ln(n)+C+1/(2*n); n很小时直接求…