씨름 O(n)으로 풀었는데 런타임 에러가 떠요

Question

package GreedyAlgorithm;

import java.util.*;

public class SsireumSelection {
static Scanner sc = new Scanner(System.in);
static ArrayList<Body> athlete = new ArrayList<>();
static int n = sc.nextInt();
static int answer;
static int maxWeight=Integer.MIN_VALUE;
public static void main(String[] args) {
for (int i = 0; i < n; i++) {
athlete.add(new Body(sc.nextInt(), sc.nextInt()));
}
Collections.sort(athlete);
for (Body b : athlete) {
if (b.weight > maxWeight) {
answer++;
maxWeight=b.weight;
}
}
System.out.println(answer);
}
public static class Body implements Comparable<Body> {
public int height;
public int weight;

public Body(int height, int weight) {
this.height = height;
this.weight = weight;
}

@Override
public int compareTo(Body o) {
return o.height - this.height;
}
}

}

yungjoon2 · Answer

죄송합니다. 분명 Main으로 했었던것같은데... 아무튼 감사합니다...!!

김태원 · Answer

안녕하세요^^ 클래스의 이름을 Main으로 해야 합니다. import java.util.*; public class Main { static Scanner sc = new Scanner(System.in); static ArrayList athlete = new ArrayList<>(); static int n = sc.nextInt(); static int answer; static int maxWeight=Integer.MIN_VALUE; public static void main(String[] args) { for (int i = 0; i < n; i++) { athlete.add(new Body(sc.nextInt(), sc.nextInt())); } Collections.sort(athlete); for (Body b : athlete) { if (b.weight > maxWeight) { answer++; maxWeight=b.weight; } } System.out.println(answer); } public static class Body implements Comparable { public int height; public int weight; public Body(int height, int weight) { this.height = height; this.weight = weight; } @Override public int compareTo(Body o) { return o.height - this.height; } } }