TheAlgorithms-C/sorting/Bead_Sort.c

//sorting of array list using bead sort
#include <stdio.h>
#include <stdlib.h>

/*Displays the array, passed to this method*/
void display(int arr[], int n){
    
    int i;
    for(i = 0; i < n; i++){
        printf("%d ", arr[i]);
    }
    
    printf("\n");
    
}

/*This is where the sorting of the array takes place
 a --- Array to be sorted
 len --- Array Size
 */
void bead_sort(int *a, int len)
{
	int i, j, max, sum;
	unsigned char *beads;
#	define BEAD(i, j) beads[i * max + j]
 
	for (i = 1, max = a[0]; i < len; i++)
		if (a[i] > max) max = a[i];
 
	beads = calloc(1, max * len);
 
	/* mark the beads */
	for (i = 0; i < len; i++)
		for (j = 0; j < a[i]; j++)
			BEAD(i, j) = 1;
 
	for (j = 0; j < max; j++) {
		/* count how many beads are on each post */
		for (sum = i = 0; i < len; i++) {
			sum += BEAD(i, j);
			BEAD(i, j) = 0;
		}
		/* mark bottom sum beads */
		for (i = len - sum; i < len; i++) BEAD(i, j) = 1;
	}
 
	for (i = 0; i < len; i++) {
		for (j = 0; j < max && BEAD(i, j); j++);
		a[i] = j;
	}
	free(beads);
}

int main(int argc, const char * argv[]) {
    int n;
    printf("Enter size of array:\n");
    scanf("%d", &n); // E.g. 8 1 2 3
    
    printf("Enter the elements of the array\n");
    int i;
    int arr[n];
    for(i = 0; i < n; i++){
        scanf("%d", &arr[i] );
    }
    
    printf("Original array: ");
    display(arr, n);
    
    bead_sort(arr, n);
    
    printf("Sorted array: ");
    display(arr, n);
    
    return 0;
}