Find Pair - JAVA

package com.company;

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

public class Problem {

    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int x = sc.nextInt();

        ArrayList<Integer> list = new ArrayList<>();

        for(int i=0; i<n; i++){
            int num = sc.nextInt();
            list.add(num);
        }
        System.out.println(findPair(list, x, n));

    }

    public static int findPair(ArrayList<Integer> list, int x, int n){
        Collections.sort(list);
        int i = 0, j = n - 1;
        while (i < j){
            if(list.get(i) + list.get(j) == x)
                return Math.abs(list.get(i) - list.get(j));
            else if(list.get(i) + list.get(j) < x)
                i++;
            else
                j--;
        }
        return -1;
    }
}