题解 | #成绩排序#

按成绩排序

          // 排序算法
            Arrays.sort(students, new Comparator<Student>(){
                @Override
                public int compare(Student stu1, Student stu2) {
                    if (comp == 1) {
                        if (stu1.score > stu2.score) return 1;
                        if (stu1.score < stu2.score) return -1;
                        return 0;
                    } else {
                        if (stu1.score < stu2.score) return 1;
                        if (stu1.score > stu2.score) return -1;
                        return 0;
                    }
                    
                }
            });

import java.util.Scanner;
import java.util.Arrays;
import java.util.Comparator;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static int comp = 0;
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (scanner.hasNextLine()) { // 注意 while 处理多个 case
            int count  = Integer.parseInt(scanner.nextLine());
            int comp = Integer.parseInt(scanner.nextLine());
            Student[] students = new Student[count];
            for (int i = 0; i < count; i++) {
                String[] temp = scanner.nextLine().split(" ");
                students[i] = new Student(temp[0], Integer.parseInt(temp[1]));
            }

            Arrays.sort(students, new Comparator<Student>(){
                @Override
                public int compare(Student stu1, Student stu2) {
                    if (comp == 1) {
                        if (stu1.score > stu2.score) return 1;
                        if (stu1.score < stu2.score) return -1;
                        return 0;
                    } else {
                        if (stu1.score < stu2.score) return 1;
                        if (stu1.score > stu2.score) return -1;
                        return 0;
                    }
                    
                }
            });
            for (Student student : students) {
                System.out.println(student.name + " " + student.score);
            }
            
        }
    }
    public static class Student {
        String name;
        int score;
        public Student(String name, int score) {
            this.name = name;
            this.score = score;
        }
    }
}