[백준] 16435번 스네이크버드 #Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.PriorityQueue;
import java.util.StringTokenizer;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine()," ");
        int n = Integer.parseInt(st.nextToken());   // 과일의 갯수
        int l = Integer.parseInt(st.nextToken());   // 초기 길이

        PriorityQueue<Integer> priorityQueue = new PriorityQueue<>();
        st = new StringTokenizer(br.readLine()," ");
        for (int i = 0; i < n; i++) {
            priorityQueue.add(Integer.parseInt(st.nextToken()));
        }

        while (!priorityQueue.isEmpty()){
            int poll = priorityQueue.poll();

            if(l >= poll){
                l++;
            }else{
                break;
            }
        }
        System.out.println(l);
    }
}