non repeating random number generator

Generate random data in PHP directly using Mt_rand can be achieved, if you want to generate non-repeating random number we can use the Unique_rand function, let me summarize the commonly used methods. The code is as follows: The code is as follows Copy Code

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

Cause: There are 25 pieces to vote, one to vote for 16, and one to vote only once per piece. In front of a programmer stabbed blunder, forgot to put the vote in the library, there are 200 user-generated voting sequence is empty. So how would you fill this blunder? Certainly reflect the situation to the superiors. But what we're talking about here is the technology that needs to generate 16 non-repeating

There are 25 pieces to vote, one to vote for 16, and one to vote only once per piece. In front of a programmer stabbed blunder, forgot to put the vote in the library, there are 200 user-generated voting sequence is empty. So how would you fill this blunder? Certainly reflect the situation to the superiors. But what we're talking about here is the technology that needs to generate 16 non-repeating

Transferred from: http://blog.csdn.net/dreamer2020/article/details/52049629Source of the problemThere are times in the business where you want to generate non-repeating random numbers, such as a new product number, room number, or other item

In JavaScript, the usual random numbers are duplicated, but sometimes we need random numbers that don't repeat, how do we do that? This article gives a solution to the needs of friends can refer to the next In JavaScript, the random numbers that are normally generated are duplicated, but sometimes we need random numbe

Whether it's a Web application, a WAP, or a mobile app, random numbers have their way. This article is about PHP n non-repeating random number generation code example The code is as follows: The code is as follows: Range is to list 1 to 42 as an array $numbers = range

First, the basic idea:Create an array, one at a time, and put it in a new array.Second, the realization method1. Method One:(1) Create an array of arr, an array of elements for all possible occurrences of the set of elements;(2) Get the random number by Num=math.floor (Math.random () *num_total*first_value) method.The range of random numbers is 0-arr.length;(3)

This article focuses on how to use PHP to generate n non-repeating random number instances , the code is as follows: The program runs as follows: The code is as follows: 2,3,4,6,7,8,9,10,11,12,13,16,20,21,22,24 The Adds several notes: the Mt_rand () function is used when generating

Take the bubble sort method as an example:1#include 2#include 3#include 4 intCreatdata (intArr[],intNintMinintmax)5 {6 intI,j,flag;7Srand (Time (NULL));//creat Data8 if(max-min+1return 0;9 for(i=0; i)Ten { One Do A { -Arr[i]= (max-min+1) *rand ()/(rand_max+1)+min; -flag=0; the for(j=0; j) - { - if(arr[i]==Arr[j]) - { +flag=1; - } + } A } at while(flag); - }

There are at least the following requirements is hashed and random, at least not guessed sequence rules is never repeated, if the build once to verify the existence, that efficiency is not too low? Reply content: There are at least the following requirements is hashed and random, at least not guessed sequence rules is never repeated, if the build once to verify the existence, that efficie

returns a random number between 0.0 and 1.0.ToString returns a String that represents the current Object. (Inherit from Object.) ）Generate non-repeating random numbers in C #We can initialize a random

returns a random number between 0.0 and 1.0.ToString returns a String that represents the current Object. (Inherit from Object.) ）Generate non-repeating random numbers in C #We can initialize a random

Random number, C language function is rand (), C + + is a random number generator (Random-number generator) = Distribution object (distribut

number is generated, it enters the do...while loop again to generate the number until the number that has not been generated is produced.For example, an array of type int is generated with a length of 50 and a number between 0-50 is inserted, and cannot be duplicated.The code is as follows:public class Myrandom {publi