Hi all, I just write my solution to solve problem 285C. but i has "Time limit exceeded on test 8" error, but another person wrote a solution like mine, but it doesn't have this probelm, what's wrong? thanks for any help. my code:

public class Main {
    public static void main(String[] args) {
        // TODO code application logic here
        Scanner sc=new Scanner(System.in);
        PrintWriter pw=new PrintWriter(System.out);
        long c=0;
        int n=sc.nextInt();
        int[] a=new int[n];
        for(int i=0;i<n;i++)
            a[i]=sc.nextInt();
        Arrays.sort(a);
        for(int i=0;i<n;i++)
            c+=Math.abs(a[i]-(i+1));
        pw.print(c);
        pw.flush();
    }
}

other guy's code:

public class Contest {
    public static void main (String [] args) {
        Scanner in = new Scanner(System.in);
        PrintWriter out = new PrintWriter(System.out);        
        int n = in.nextInt();
        List <Integer> aa = new ArrayList <Integer> ();
        int [] a = new int[n];
        int t  = 7;
        long counter = 0;
        for(int i = 0; i < n; ++i) {
            a[(i + t) % n] = in.nextInt();
        }
        Arrays.sort(a);
        for(int i = 0; i < n; ++i){
            counter += Math.abs((i + 1) - a[i]);
        }
        out.println(counter);
        out.flush();
    } 
}