[算法]求若干个线段的最大重合个数

package com.darrenchan;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Test{
    public static int getNum(List<Line> list){
        int max = Integer.MIN_VALUE;
        //排序
        Collections.sort(list);
        for (int i = 0; i < list.size(); i++) {
            int sum = 1;
            for (int j = i + 1; j < list.size(); j++) {
                if(list.get(j).start < list.get(i).end){
                    sum++;
                }
            }
            max = Math.max(max, sum);
        }
        return max;
    }

    public static void main(String[] args) {
        Line line1 = new Line(0,6);
        Line line2 = new Line(0,5);
        Line line3 = new Line(0,4);
        List<Line> list = new ArrayList<>();
        list.add(line1);
        list.add(line2);
        list.add(line3);
        int max = getNum(list);
        System.out.println(max);
    }
}

class Line implements Comparable<Line> {
    public int start;
    public int end;
    public Line(int start, int end){
        this.start = start;
        this.end = end;
    }
    @Override
    public int compareTo(Line o) {
        return this.end - o.end;
    }
}