Code:
package com.executecodes.combinatorial;
import java.util.Arrays;
import java.util.Scanner;
public class HeapsPermutation
{
private static void swap(int[] v, int i, int j)
{
int t = v[i];
v[i] = v[j];
v[j] = t;
}
public void permute(int[] v, int n)
{
if (n == 1)
{
System.out.println(Arrays.toString(v));
}
else
{
for (int i = 0; i < n; i++)
{
permute(v, n - 1);
if (n % 2 == 1)
{
swap(v, 0, n - 1);
}
else
{
swap(v, i, n - 1);
}
}
}
}
public static void main(String[] args)
{
System.out.println("Enter the number of elements in a sequence: ");
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
System.out.println("Enter the sequence: ");
int sequence[] = new int[n];
for (int i = 0; i < n; i++)
{
sequence[i] = sc.nextInt();
}
new HeapsPermutation().permute(sequence, n);
sc.close();
}
}
Output:
Enter the number of elements in a sequence:
5
Enter the sequence:
2 4 7 3 8
[2, 4, 7, 3, 8]
[4, 2, 7, 3, 8]
[7, 2, 4, 3, 8]
[2, 7, 4, 3, 8]
[4, 7, 2, 3, 8]
[7, 4, 2, 3, 8]
[3, 4, 7, 2, 8]
[4, 3, 7, 2, 8]
[7, 3, 4, 2, 8]
[3, 7, 4, 2, 8]
[4, 7, 3, 2, 8]
[7, 4, 3, 2, 8]
[3, 2, 7, 4, 8]
[2, 3, 7, 4, 8]
[7, 3, 2, 4, 8]
[3, 7, 2, 4, 8]
[2, 7, 3, 4, 8]
[7, 2, 3, 4, 8]
[3, 2, 4, 7, 8]
[2, 3, 4, 7, 8]
[4, 3, 2, 7, 8]
[3, 4, 2, 7, 8]
[2, 4, 3, 7, 8]
[4, 2, 3, 7, 8]
[8, 2, 4, 7, 3]
[2, 8, 4, 7, 3]
[4, 8, 2, 7, 3]
[8, 4, 2, 7, 3]
[2, 4, 8, 7, 3]
[4, 2, 8, 7, 3]
[7, 2, 4, 8, 3]
[2, 7, 4, 8, 3]
[4, 7, 2, 8, 3]
[7, 4, 2, 8, 3]
[2, 4, 7, 8, 3]
[4, 2, 7, 8, 3]
[7, 8, 4, 2, 3]
[8, 7, 4, 2, 3]
[4, 7, 8, 2, 3]
[7, 4, 8, 2, 3]
[8, 4, 7, 2, 3]
[4, 8, 7, 2, 3]
[7, 8, 2, 4, 3]
[8, 7, 2, 4, 3]
[2, 7, 8, 4, 3]
[7, 2, 8, 4, 3]
[8, 2, 7, 4, 3]
[2, 8, 7, 4, 3]
[3, 8, 2, 4, 7]
[8, 3, 2, 4, 7]
[2, 3, 8, 4, 7]
[3, 2, 8, 4, 7]
[8, 2, 3, 4, 7]
[2, 8, 3, 4, 7]
[4, 8, 2, 3, 7]
[8, 4, 2, 3, 7]
[2, 4, 8, 3, 7]
[4, 2, 8, 3, 7]
[8, 2, 4, 3, 7]
[2, 8, 4, 3, 7]
[4, 3, 2, 8, 7]
[3, 4, 2, 8, 7]
[2, 4, 3, 8, 7]
[4, 2, 3, 8, 7]
[3, 2, 4, 8, 7]
[2, 3, 4, 8, 7]
[4, 3, 8, 2, 7]
[3, 4, 8, 2, 7]
[8, 4, 3, 2, 7]
[4, 8, 3, 2, 7]
[3, 8, 4, 2, 7]
[8, 3, 4, 2, 7]
[7, 3, 8, 2, 4]
[3, 7, 8, 2, 4]
[8, 7, 3, 2, 4]
[7, 8, 3, 2, 4]
[3, 8, 7, 2, 4]
[8, 3, 7, 2, 4]
[2, 3, 8, 7, 4]
[3, 2, 8, 7, 4]
[8, 2, 3, 7, 4]
[2, 8, 3, 7, 4]
[3, 8, 2, 7, 4]
[8, 3, 2, 7, 4]
[2, 7, 8, 3, 4]
[7, 2, 8, 3, 4]
[8, 2, 7, 3, 4]
[2, 8, 7, 3, 4]
[7, 8, 2, 3, 4]
[8, 7, 2, 3, 4]
[2, 7, 3, 8, 4]
[7, 2, 3, 8, 4]
[3, 2, 7, 8, 4]
[2, 3, 7, 8, 4]
[7, 3, 2, 8, 4]
[3, 7, 2, 8, 4]
[4, 7, 3, 8, 2]
[7, 4, 3, 8, 2]
[3, 4, 7, 8, 2]
[4, 3, 7, 8, 2]
[7, 3, 4, 8, 2]
[3, 7, 4, 8, 2]
[8, 7, 3, 4, 2]
[7, 8, 3, 4, 2]
[3, 8, 7, 4, 2]
[8, 3, 7, 4, 2]
[7, 3, 8, 4, 2]
[3, 7, 8, 4, 2]
[8, 4, 3, 7, 2]
[4, 8, 3, 7, 2]
[3, 8, 4, 7, 2]
[8, 3, 4, 7, 2]
[4, 3, 8, 7, 2]
[3, 4, 8, 7, 2]
[8, 4, 7, 3, 2]
[4, 8, 7, 3, 2]
[7, 8, 4, 3, 2]
[8, 7, 4, 3, 2]
[4, 7, 8, 3, 2]
[7, 4, 8, 3, 2]
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