[백준] 32172 현권이와 신기한 수열 - Data Structure / Java

• 문제 링크

https://www.acmicpc.net/problem/32172

 

• 풀이 코드

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        boolean[] arr = new boolean[600000];
        int n = read(), a = 0, b;
        for (int i = 1; i <= n; i++, arr[a] = true, a = b) if ((b = a - i) < 0 || arr[b]) b = a + i;

        bw.write(String.valueOf(a));
        bw.flush();
    }

    private static int read() throws IOException {
        int c, n = System.in.read() & 15;
        while ((c = System.in.read()) > 32) n = (n << 3) + (n << 1) + (c & 15);

        return n;
    }

}