UVA - 10038 - Jolly Jumpers

import java.util.ArrayList;
import java.util.Scanner;

public class Main {

    public static void main(String[] args){
        Scanner s=new Scanner(System.in);
        StringBuilder sb = new StringBuilder("");
        while (s.hasNext()) {
            int size=s.nextInt();
            int[] arr=new int[size];
            for(int i=0;i<arr.length;i++){
                arr[i]=s.nextInt();
            }
            if(size ==1){
                sb.append("Jolly").append("\n");
                continue;
            }
            boolean jolly=true;
            ArrayList<Integer> col=new ArrayList<Integer>();
            int dist=Math.abs(arr[1]-arr[0]);
            if(dist>size-1 || dist==0){
                sb.append("Not jolly").append("\n");
                continue;
            }
            col.add(dist);
            for(int i=1;i<arr.length-2;i++){
                int aft=Math.abs(arr[i+1]-arr[i]);
                if(col.contains(aft) ||aft==0 || aft>size-1){
                    jolly=false;
                    break;
                }
                col.add(aft);
                dist=aft;
            }
            if(jolly)
                sb.append("Jolly").append("\n");
            else
                sb.append("Not jolly").append("\n");
        }
        System.out.print(sb);
    }
}