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C++ Program for BogoSort or Permutation Sort

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  • Last Updated : 13 Jun, 2022
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BogoSort also known as permutation sort, stupid sort, slow sort, shotgun sort or monkey sort is a particularly ineffective algorithm based on generate and test paradigm. The algorithm successively generates permutations of its input until it finds one that is sorted.(Wiki
For example, if bogosort is used to sort a deck of cards, it would consist of checking if the deck were in order, and if it were not, one would throw the deck into the air, pick the cards up at random, and repeat the process until the deck is sorted. 
PseudoCode: 
 

while not Sorted(list) do
    shuffle (list)
done

 

CPP




// C++ implementation of Bogo Sort
#include <bits/stdc++.h>
using namespace std;
 
// To check if array is sorted or not
bool isSorted(int a[], int n)
{
    while (--n > 0)
        if (a[n] < a[n - 1])
            return false;
    return true;
}
 
// To generate permutation of the array
void shuffle(int a[], int n)
{
    for (int i = 0; i < n; i++)
        swap(a[i], a[rand() % n]);
}
 
// Sorts array a[0..n-1] using Bogo sort
void bogosort(int a[], int n)
{
    // if array is not sorted then shuffle
    // the array again
    while (!isSorted(a, n))
        shuffle(a, n);
}
 
// prints the array
void printArray(int a[], int n)
{
    for (int i = 0; i < n; i++)
        printf("%d ", a[i]);
    printf("\n");
}
 
// Driver code
int main()
{
    int a[] = { 3, 2, 5, 1, 0, 4 };
    int n = sizeof a / sizeof a[0];
    bogosort(a, n);
    printf("Sorted array :\n");
    printArray(a, n);
    return 0;
}


Output: 

Sorted array :
0 1 2 3 4 5

 

Time Complexity:

Worst Case: O(∞) (since this algorithm has no upper bound)
Average Case: O(n*n!)
Best Case: O(n)(when the array given is already sorted)

Auxiliary Space: O(1)

Please refer complete article on BogoSort or Permutation Sort for more details!
 


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