[프로그래머스] Lv3. 단속카메라 - Javascript

문제링크

문제풀이

function solution(routes) {
    let answer = 0; // [-20,-15],[-18,-13],[-17,-5],[-16,-3]
    routes.sort((a,b)=>a[1]-b[1]);
    let i=1;
    let start=routes[0][1];
    while(i<routes.length){
        if(start<routes[i][0]){
            answer++;
            start=routes[i][1];
        }
        i++;
    }
    answer++;    
    return answer;
}