CSP 201912-2 回收站选址 Java 满分

import java.util.*;

public class Main {
    public static void main(String[] args) {
        LinkedHashSet<Point> points = new LinkedHashSet<Point>();   //存储输入的垃圾点
        HashSet<Point> condition1 = new HashSet<Point>();   //存储某个垃圾点上下左右位置垃圾点
        HashSet<Point> condition2 = new HashSet<Point>();   //存储某个垃圾点四个对焦位置垃圾点
        int[] num = new int[5];         //存储得分的数组
        int flag = 0;
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        //输入垃圾点,并存入points中
        for (int i = 0; i < n; i++) {
            int tempX = sc.nextInt();
            int tempY = sc.nextInt();
            points.add(new Point(tempX, tempY));
        }
        //创建垃圾点的迭代器
        Iterator<Point> iterator = points.iterator();
        while (iterator.hasNext()) {
            flag = 0;//表示得分数
            //迭代每个垃圾点时,重置存储此垃圾点周围垃圾点的Set
            condition1.clear();
            condition2.clear();
            Point p = iterator.next();
            //创建此垃圾点上下左右位置的垃圾点,并存入condition1中
            condition1.add(new Point(p.x + 1, p.y));
            condition1.add(new Point(p.x - 1, p.y));
            condition1.add(new Point(p.x, p.y + 1));
            condition1.add(new Point(p.x, p.y - 1));
            //判断此垃圾点是否包含上下左右垃圾点
            if (points.containsAll(condition1)) {
                //创建此垃圾点四个对角位置的垃圾点,并存入condition2中
                condition2.add(new Point(p.x + 1, p.y + 1));
                condition2.add(new Point(p.x - 1, p.y - 1));
                condition2.add(new Point(p.x - 1, p.y + 1));
                condition2.add(new Point(p.x + 1, p.y - 1));
                Iterator<Point> iteratorCon = condition2.iterator();
                while (iteratorCon.hasNext()) {
                    Point point = iteratorCon.next();
                    if (points.contains(point)) {
                        flag++;
                    }
                }
            } else {
                continue;
            }
            num[flag]++;
        }
        for (int i = 0; i < 5; i++) {
            System.out.println(num[i]);
        }
    }
}

class Point {
    int x;
    int y;

    Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Point point = (Point) o;
        return x == point.x &&
                y == point.y;
    }

    @Override
    public int hashCode() {
        return Objects.hash(x, y);
    }
}