[백준] 17291 새끼치기 - Dynamic Programming / Java

• 문제 링크

17291번: 새끼치기

 

• 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));

        int n = read();

        int[] dp = new int[n + 1];
        dp[0] = dp[1] = 1;

        for (int i = 2; i <= n; i++) {
            dp[i] = dp[i - 1] * 2;
            if (i % 2 == 0) dp[i] -= (i - 4 > -1 ? dp[i - 4] : 0) + (i - 5 > -1 ? dp[i - 5] : 0);
        }

        bw.write(String.valueOf(dp[n]));
        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;
    }

}