P1803 凌乱的yyy / 线段覆盖

P1803 凌乱的yyy / 线段覆盖

一、题目描述？

二、ac代码

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

public class Main
{
public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
time[] times=new time[n];
for(int i=0;i<n;i++)
{
int t=sc.nextInt();
int e=sc.nextInt();
times[i]=new time(t,e);
}
Arrays.sort(times,new CompareTo());
int start2=0;
int sum=0;
for(int i=0;i<n;i++)
{
if(start2<=times[i].start)
{
sum++;
start2=times[i].end;
}
}
System.out.println(sum);
}
}
class time
{
public int start;
public int end;
public time(){};
public time(int s,int e)
{
this.start=s;
this.end=e;
}
}

class CompareTo implements Comparator
{
public int compare(time t1, time t2) {
return t1.end-t2.end;
}
}