non repeating random number generator

1. Question Given a random number generator, this generator can generate a random number ranging from 1 to 5 () evenly. How can we use this generator to generate a

. Next (IUP);　　 The following code specifies that the return value must be within the range of 50-100: int iresult; int iup=100; int idown=50; Iresult=ro. Next (IDOWN,IUP);　　 In addition to the Random.next () method, the random class provides the random.nextdouble () method to produce a random double-precision floating-point number that ranges between 0.0 and

ProblemThere is a need, in such an array String[] arr = new String[]{"电商", "互联网", "小程序", "网络推广", "文化", "教育", "造型设计", "服装设计"}; , to randomly take n options and do not repeat, n is random and within the range of 1-m, where M is a definite number and mIdeasTake a random number from a specific interval// 从区间[1,4]随机取一个数new

When we do an exam system that automatically generates test papers, we often need to randomly generate a set of non-recurring topics, and a class system.random that is dedicated to generating random numbers in the. NET Framework. For random numbers, we all know that the computer can not produce a completely random

Produces an unordered array of length 100, consisting of a number from 0 to 99, with different elements.In other words, a continuous array of 0 to 100 is scattered.by three different ways.One: Using list and random numberslongs1=system.currenttimemillis (); //listar= newarraylist ();//for (inti=0;i Two. Create an unordered array by swapping the position of the original array element instead of removing the

Method One: Generate two (1,5) random number, this is a total of 25 cases, note that the two numbers are in order, from the 25 cases, take the first 21, each three kinds of representative (1,7) A number, if you take the case of the 21, discard the re-fetch.Method Two: Generate three (1,5) random numbers, representing a

random number generator RAND (defined in stdlib.h) that can return a pseudo-random integer evenly distributed between 0-rand_max (Rand_max is at least 32767, and generally defaults to 32767).For example:#include #include void Main (){for (int i=0;iprintf ("%d\n", Rand ());}If we are running for the first time and are

Source: http://www.ido321.com/1217.htmlWhether it's a Web application, a WAP, or a mobile app, random numbers have their way. In several recent small projects, I also often need to deal with random numbers or random arrays, so, for PHP how to produce non-repeating

Whether it's a Web application, a WAP, or a mobile app, random numbers have their way. I also often need to deal with random numbers or random arrays in several small projects that I have recently contacted, so there are a few ways to summarize how PHP produces non-repeating

Source: http://www.ido321.com/1217.htmlWhether it's a Web application, a WAP, or a mobile app, random numbers have their way. In several recent small projects, I also often need to deal with random numbers or random arrays, so, for PHP how to produce non-repeating

Method 1 (Simple)We can consider all substrings one by one and check for each substring whether it contains all unique characters or not. there will be n * (n + 1)/2 substrings. whether a substirng contains all unique characters or not can be checked in linear time by scanning it from left to right and keeping a map of visited characters. time complexity of this solution wocould be O (n ^ 3 ). Method 2 (Linear Time)Let us talk about the linear time solution now. this solution uses extra space to

Whether it's a Web application, a WAP, or a mobile app, random numbers have their way. In several recent small projects, I also often need to deal with random numbers or random arrays, so, for PHP how to produce non-repeating random