Method for Generating Random Arrays

 

This article will show you how to generate a random, non-repeating array (or a list). Of course, the number to be filled is an integer.

Let's take a look at how to implement it:

# Include <iostream> # include <algorithm> a [(I =; I <; I ++ a [I] = * a_begin = * a_end = a + () /(j =; j <; j ++ cout <a [j] <}Test_Random.cpp

1. First create an array object a []. Of course, you can also use double or other types of arrays as needed.

2. assign an initial value to the array. In the code, the for loop directly assigns 1 ~ to each element in ~ An integer of 1000.

3. Use random_shuffle Gaussian to randomly disrupt the elements in the array, which generates a random array. If you want to make it messy, you can call random_shuffle multiple times to perform the operation.

4. Show the random array to view the effect.

 

Q: What if I want to generate a variable-length random series?Is the following method feasible?

int   main()   {   int* a = null;        a = new int[1000];for(int i=0;i<1000;i++){a[i] = i;}int*   a_begin   =   a;   int*   a_end   =   a   +   sizeof(a)/sizeof(int);   random_shuffle(a_begin,a_end);   for(int j=0;   j<1000;   j++)   {   cout<<a[j]<<"\t";   }  getchar();return 0;}

Note: If you are interested in the above Code, please try it as much as you can, so you don't have to worry that your friends are stunned!

 

Solution: To generate a variable-length random sequence, what is the correct and feasible Solution?

# Include <iostream> # include <vector> # include <algorithm> vector <> (I =; I <; I ++ (j =; j <. size (); j ++ cout <a [j] <(! A. swap (vector <>}TestRandom2.cpp

1. First create vector <> Object a. Of course, double or other types can be used as needed.

2. Insert 1000 elements in a for loop. The value range is 1 ~ 1000.

3. Use random_shuffle Gaussian to randomly disrupt the elements in the array, which generates a random array. If you want to make it messy, you can call random_shuffle multiple times to perform the operation.

4. Show the random array to view the effect.

5. Clear the vector at the end <>.