一个关于考研机试的问题（牛客网 清华大学考研真题 成绩排序）

[麦克斯韦的妖精]

今天打开牛客网打算做一道考研的机试题，选择了牛客网上的第一道，是清华大学的一道题目，名字叫成绩排序（题目链接：https://www.nowcoder.com/practice/0383714a1bb749499050d2e0610418b1?tpId=40&tqId=21333&tPage=1&rp=1&ru=/ta/kaoyan&qru=/ta/kaoyan/question-ranking）。题目叙述如下



以下是我写的Java代码：

import java.util.*;
/**
 * 清华大学 成绩排序
 * @author sdu20
 *
 */
public class Main {
	
	private String name;
	private int grade;
	private int num;
	private static Main[] people;
		
	public Main(String name,int grade,int num){
		this.name = name;
		this.grade = grade;
		this.num = num;
	}
		
	public String getName(){
		return name;
	}
		
	public int getGrade(){
		return grade;
	}
		
	public int getNum(){
		return num;
	}
		
	public boolean bigger(Main he){
		if(this.grade>he.getGrade())
			return true;
		else if(this.grade<he.getGrade())
			return false;
		else if(this.num<he.getNum())
			return false;
		else
			return true;
	}
	
	public boolean less(Main he){
		if(this.grade>he.getGrade())
			return false;
		else if(this.grade<he.getGrade())
			return true;
		else if(this.num<he.getNum())
			return false;
		else
			return true;
	}
	
	public void resetValue(String name,int grade,int num){
		this.name = name;
		this.grade = grade;
		this.num = num;
	}
	
	public static Main[] upSort(){
		for(int i = 0;i<people.length-1;i++){
			int index = i;
			for(int j = i+1;j<people.length;j++){
				if(people[index].bigger(people[j])){
					index = j;
				}					
			}
			//System.out.println(index);
			if(index != i){
				
				String iname = people[i].getName();
				int igrade = people[i].getGrade();;
				int inum = people[i].getNum();
				people[i].resetValue(people[index].getName(),people[index].getGrade(),people[index].getNum());
				people[index].resetValue(iname, igrade, inum);
			}
			
		}
		
		return people;
	}
	
	public static Main[] downSort(){
		for(int i = 0;i<people.length-1;i++){
			int index = i;
			for(int j = i+1;j<people.length;j++){
				if(people[index].less(people[j])){
					index = j;
				}					
			}
			//System.out.println(index);
			if(index != i){
				
				String iname = people[i].getName();
				int igrade = people[i].getGrade();;
				int inum = people[i].getNum();
				people[i].resetValue(people[index].getName(),people[index].getGrade(),people[index].getNum());
				people[index].resetValue(iname, igrade, inum);
			}
			
		}
		
		return people;
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		int len = in.nextInt();
		int kind = in.nextInt();
		people = new Main[len];
		for(int i = 0;i<len;i++){
			String name = in.next();
			int grade = in.nextInt();
			people[i] = new Main(name,grade,i);
		}
		
		if(kind==0){
			downSort();
		}else if(kind==1){
			upSort();			
		}
		for(int i = 0;i<people.length;i++){
			System.out.println(people[i].getName()+" "+people[i].getGrade());
		}

	}
	
}

但是提交之后提示不通过


于是我就讲它提示出错的测试用例粘贴到eclipse中，发现输出结果与它给的结果是一样的。

由于是第一次用牛客网做ACM题，所以不知道是不是有什么套路，还请大神们不吝赐教。

[麦克斯韦的妖精]

自己顶一下