[BOJ] 27514 1차원 2048 (JAVA)

https://www.acmicpc.net/problem/27514

27514번: 1차원 2048

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

public class Main {
	
    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    static StringBuilder sb = new StringBuilder();
    static StringTokenizer st;
    static int N;
    static long pre, now, max;

    public static void main(String[] args) throws Exception {

        PriorityQueue<Long> pq = new PriorityQueue<>();
        N = Integer.parseInt(br.readLine());
        st = new StringTokenizer(br.readLine(), " ");
        for (int i = 0; i < N; i++) {
            pq.offer(Long.parseLong(st.nextToken()));
        } // end of input

        while(!pq.isEmpty()) {

            now = pq.poll();

            if (now == 0) continue;

            max = Math.max(max, now);

            if (pre == now) {
                pre = 0;
                pq.offer(now * 2);
            } else pre = now;

        }

        System.out.println(max);

    }
	
}