PREV-5 错误票据

题目：

import java.util.*;

public class Main{

    public static void main(String[] args) {
        Scanner read = new Scanner(System.in);
        String n = read.nextLine();
        List<Integer> list = new ArrayList<>();
        int num1 = 0;
        int num2 = 0;

        for (int i = 0; i < Integer.valueOf(n); i++) {
            String str = read.nextLine();
            String[] array = str.trim().split("\\s+");

            for (int j = 0;j < array.length; j++){
                list.add(Integer.valueOf(array[j]));
            }
        }
        Collections.sort(list);

        for(int i = 0;i< list.size()-1 ; i++){
            if(list.get(i)+1 == list.get(i+1)+1){
                num1 = list.get(i);
            }
            if(list.get(i) + 2 == list.get(i+1) ){
                num2 = list.get(i) + 1;
            }
        }

        System.out.println(num2 +" " +num1);
    }
}