programmers_단속카메라_java

https://school.programmers.co.kr/learn/courses/30/lessons/42884

프로그래머스

import java.util.*;
class Solution {
    public int solution(int[][] routes) {
        int answer = 0;
        
        Arrays.sort(routes, (o1, o2) -> o1[1] - o2[1]);         

        int pos = Integer.MIN_VALUE;
        
        for(int[] route : routes) {
            if(pos < route[0]) {
                pos = route[1];
                answer++;
            }
        }
        
        return answer;
    }
}