79 lines
1.6 KiB
C
79 lines
1.6 KiB
C
/*
|
|
* C Program to Implement Pigeonhole Sort
|
|
*/
|
|
#include <stdio.h>
|
|
|
|
#define MAX 7
|
|
|
|
void pigeonhole_sort(int, int, int *);
|
|
void main()
|
|
{
|
|
int a[MAX], i, min, max;
|
|
printf("enter the values into the matrix :");
|
|
for (i = 0; i < MAX; i++)
|
|
{
|
|
scanf("%d", &a[i]);
|
|
}
|
|
min = a[0];
|
|
max = a[0];
|
|
for (i = 1; i < MAX; i++)
|
|
{
|
|
if (a[i] < min)
|
|
{
|
|
min = a[i];
|
|
}
|
|
if (a[i] > max)
|
|
{
|
|
max = a[i];
|
|
}
|
|
}
|
|
pigeonhole_sort(min, max, a);
|
|
printf("Sorted order is :\n");
|
|
for (i = 0; i < MAX; i++)
|
|
{
|
|
printf("%d", a[i]);
|
|
}
|
|
}
|
|
|
|
/* sorts the array using pigeonhole algorithm */
|
|
void pigeonhole_sort(int mi, int ma, int * a)
|
|
{
|
|
int size, count = 0, i;
|
|
int *current;
|
|
current = a;
|
|
size = ma - mi + 1;
|
|
int holes[size];
|
|
for (i = 0; i < size; i++)
|
|
{
|
|
holes[i] = 0;
|
|
}
|
|
for (i = 0; i < size; i++, current++)
|
|
{
|
|
holes[*current-mi] += 1;
|
|
}
|
|
for (count = 0, current = &a[0]; count < size; count++)
|
|
{
|
|
while (holes[count]--> 0)
|
|
{
|
|
*current++ = count + mi;
|
|
}
|
|
}
|
|
}
|
|
/*
|
|
*OUTPUT:
|
|
|
|
/* average case
|
|
enter the values into the matrix :7 3 8 2 5 4 9
|
|
Sorted order is :
|
|
2345789
|
|
|
|
/* best case
|
|
enter the values into the matrix :1 2 3 4 5 6 7
|
|
Sorted order is :
|
|
1234567
|
|
|
|
/* worst case
|
|
enter the values into the matrix :7 6 5 4 3 2 1
|
|
Sorted order is :
|
|
1234567
|
|
*/ |