View difference between Paste ID: QEeYYCrA and hv5cTAG3

 // Author : Saurav Kalsoor
-// Disjoint Sum - JAVA
+// Duplicate Bogies - JAVA
 
 
 import java.util.*;
 
 public class Test {
 
     static Scanner sc = new Scanner(System.in);
 
     public static void main(String[] args) {
     	int n = sc.nextInt();
 
 		ArrayList<Integer> arr = new ArrayList<>();
 		for(int i=0; i < n ;i++){
 			arr.add(sc.nextInt());
 		}
-		disjointSum(n, arr);
+		System.out.println(duplicateBogies(n, arr));
     }
 
-	public static void disjointSum(int n, ArrayList<Integer> arr){
+	public static int duplicateBogies(int n, ArrayList<Integer> arr){
 		HashSet<Integer> st = new HashSet<>();
 		int res = n;
 		for(int x : arr){
 			if(st.contains(x)){
 				res = (n - st.size());
-		ArrayList<Integer> result = new ArrayList<>();
+				break;
-		for(int i=1; i <= n; i++){
+			}
-			result.add(Math.max(i, st.size()));
+
 		}
 
-		for(int x  :result){
+		Collections.reverse(arr);
-			System.out.print(x + " ");
+		st.clear();
 
-		System.out.println();
+
 			if(st.contains(x)){
 				res = Math.min(res, (n - st.size()));
 				break;
 			}
 			st.add(x);
 		}
 
 		if(res == n) res = 0;
 
 		return res;
 	}
 
 }