Java Exercises: Permutation sort Algorithm
Java Sorting Algorithm: Exercise-15 with Solution
Write a Java program to sort an array of given integers using Permutation sort Algorithm.
Implement a permutation sort, which proceeds by generating the possible permutations of the input array/list until discovering the sorted one.
Sample Solution:
Java Code:
import java.util.List;
import java.util.ArrayList;
import java.util.Arrays;
public class PermutationSort
{
public static void main(String[] args)
{
int[] a={7, -5, 3, 2, 1, 0, 45};
System.out.println("Unsorted: " + Arrays.toString(a));
a=pSort(a);
System.out.println("Sorted: " + Arrays.toString(a));
}
public static int[] pSort(int[] a)
{
List<int[]> list=new ArrayList<int[]>();
permute(a,a.length,list);
for(int[] x : list)
if(isSorted(x))
return x;
return a;
}
private static void permute(int[] a, int n, List<int[]> list)
{
if (n == 1)
{
int[] b=new int[a.length];
System.arraycopy(a, 0, b, 0, a.length);
list.add(b);
return;
}
for (int i = 0; i < n; i++)
{
swap(a, i, n-1);
permute(a, n-1, list);
swap(a, i, n-1);
}
}
private static boolean isSorted(int[] a)
{
for(int i=1;i<a.length;i++)
if(a[i-1]>a[i])
return false;
return true;
}
private static void swap(int[] arr,int i, int j)
{
int temp=arr[i];
arr[i]=arr[j];
arr[j]=temp;
}
}
Sample Output:
Unsorted: [7, -5, 3, 2, 1, 0, 45] Sorted: [-5, 0, 1, 2, 3, 7, 45]
Flowchart:
Java Code Editor:
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Previous: Write a Java program to sort an array of given integers using Pancake sort Algorithm.
Next: Write a Java program to sort an array of given integers Shell Sort Algorithm.
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Java: Tips of the Day
How to sort an ArrayList?
Collections.sort(testList); Collections.reverse(testList);
That will do what you want. Remember to import Collections though!
Ref: https://bit.ly/32urdSe
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