题解 | #成绩排序#

import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNext()) { // 注意 while 处理多个 case
            int n = Integer.parseInt(in.nextLine());
            int method = Integer.parseInt(in.nextLine());
            List<String[]> list = new ArrayList<>();
            while (n > 0) {
                String[] item = in.nextLine().split(" ");

                list.add(item);
                n--;
            }
            sort(list, method);

        }
    }

    private static void sort(List<String[]> list, int method) {
        list.sort(new Comparator<String[]>() {
            @Override
            public int compare(String[] o1, String[] o2) {
                int v1 = Integer.parseInt(o1[1]);
                int v2 = Integer.parseInt(o2[1]);
                if (method == 0) {
                    int temp = v1;
                    v1 = v2;
                    v2 = temp;
                }

                if (v1 > v2) return 1;
                else if(v1 < v2) return -1;
                return 0;
            }
        });
        for (String[] arr: list) {
            System.out.println(arr[0] +" "+ arr[1]);
        }
    }
}