Method main

Java/Leetcode/Leetcode442.java:6–10

(String[] args)

public class Leetcode442 {
    public static void main(String[] args) {
        int arr[]={4,3,2,7,8,2,3,1};
        List<Integer> ans=duplicate(arr);
        System.out.println(ans);
    }


    static List<Integer> duplicate(int[] arr){