TheAlgorithms-C-Plus-Plus/Sorting/Slow Sort.cpp

//Returns the sorted vector after performing SlowSort
//It is a sorting algorithm that is of humorous nature and not useful. 
//It's based on the principle of multiply and surrender, a tongue-in-cheek joke of divide and conquer. 
//It was published in 1986 by Andrei Broder and Jorge Stolfi in their paper Pessimal Algorithms and Simplexity Analysis.
//This algorithm multiplies a single problem into multiple subproblems
//It is interesting because it is provably the least efficient sorting algorithm that can be built asymptotically, 
//and with the restriction that such an algorithm, while being slow, must still all the time be working towards a result.

#include<iostream>
using namespace std;

void SlowSort(int a[], int i, int j)
{
  if(i>=j)
    return;
  int m=i+(j-i)/2;            //midpoint, implemented this way to avoid overflow
  int temp;
  SlowSort(a, i, m);
  SlowSort(a, m + 1, j);
  if(a[j]<a[m])
  {
    temp=a[j];                //swapping a[j] & a[m]
    a[j]=a[m];
    a[m]=temp;
  }
  SlowSort(a, i, j - 1);
}

//Sample Main function

int main()
{
    int size;
    cout<<"\nEnter the number of elements : ";

    cin>>size;

    int arr[size];
    
    cout<<"\nEnter the unsorted elements : ";

    for (int i = 0; i < size; ++i)
    {
        cout<<"\n";
        cin>>arr[i];
    }

    SlowSort(arr, 0, size);
 
    cout<<"Sorted array\n";
    
    for (int i = 0; i < size; ++i)
    {
        cout << arr[i] << " ";
    }
    return 0;
}