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C Program to Implement Cyclesort

C Program to Implement Cyclesort

This C Program implements cyclesort. Cycle sort is an in-place, unstable sorting algorithm, a comparison sort that is theoretically optimal in terms of the total number of writes to the original array, unlike any other in-place sorting algorithm. It is based on the idea that the permutation to be sorted can be factored into cycles, which can individually be rotated to give a sorted result.

    #include <stdio.h>

    #define MAX 8

    void cycle_sort(int *);

    void main()

    {

        int a[MAX],x;

        printf("enter the elements into array :");

        for (x = 0;x < MAX; x++)

        {

            scanf("%d", &a[x]);

        }

        cycle_sort(a);

        printf("sorted elements are :\n");

        for (x = 0;x < MAX; x++)

        {

            printf("%d", a[x]);

        }

    }

    /* sorts elements using cycle sort algorithm */

    void cycle_sort(int * a)

    {

        int temp, item, pos, x, j, k;

        for (x = 0;x < MAX; x++)

        {

            item = a[x];

            pos = x;

            do

            {

                k = 0;

                for (j = 0;j < MAX;j++)

                {

                    if (pos != j && a[j] < item)

                    {

                        k++;

                    }

                }

                if (pos != k)

                {

                    while (pos != k && item == a[k])

                    {

                        k++;

                    }

                    temp = a[k];

                    a[k] = item;

                    item = temp;

                    pos = k;

                }

            }while (pos != x);

        }

    }