[알고리즘] 백준 2164번 : 카드2 (실버4)

 

📌 문제

https://www.acmicpc.net/problem/2164

2164번: 카드2

 

📌 알고리즘 풀이

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayDeque;
import java.util.Deque;

class Main {

	public static void main(String[] args) throws NumberFormatException, IOException {
		
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

		int N = Integer.parseInt(br.readLine());
		
		Deque<Integer> dq = new ArrayDeque<>();
		
		for(int i=1; i<=N; i++) {
			dq.offer(i);
		}
		
		while(dq.size() != 1) {
			dq.pollFirst();  // 첫 번째 요소 제거
			dq.offerLast(dq.pollFirst());  // 첫 번째 요소를 맨 뒤로 보내기
		}
		
		bw.write(String.valueOf(dq.pollFirst()));
		
		bw.close();
	}
}