Remove duplicate element

Problem to remove the duplicate elements in an array.

Example-1:

Input    : n = [ 30, 20, 10, 20, 30]
Output   : [10,20,30]  
Explain  : Remove duplicate element (20,30).

Example-2:

Input    : n = [ 50, 20, 10, 20, 40]
Output   : [50,20,10,40]  
Explain  : Remove duplicate element (20).

Solution

import java.util.HashSet;

public class Main
{
    public static void main(String [] args)
    {
        int a [] = { 30, 20, 10, 20, 30};

        HashSet<Integer> number = new HashSet<Integer>();

        for(int i=0;i<a.length;i++) 
        {
            number.add(a[i]);
        }

        System.out.print(number);
    }
}

n = [ 30, 20, 10, 20, 30]

a = list(set(n))

print(a)

Output

[20,10,30]