[20250214] BOJ / P5 / The Way / 권혁준

Author: oncsr

khj20006/202502/14 BOJ P5 The Way.md

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+```java
+
+import java.util.*;
+import java.io.*;
+
+class Main {
+	
+	// IO field
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+	static StringTokenizer st;
+
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static int nextInt() {return Integer.parseInt(st.nextToken());}
+	static long nextLong() {return Long.parseLong(st.nextToken());}
+	static void bwEnd() throws Exception {bw.flush();bw.close();}
+	
+	// Additional field
+	static int N;
+	static long mod = (long)1e9 + 9;
+	static long[] dp;
+	static int[] G = {1,2,1,-1,-2,-1};
+	
+	public static void main(String[] args) throws Exception {
+		
+		ready();
+		solve();
+	
+		bwEnd();
+	}
+	
+	static void ready() throws Exception{
+		
+		N = Integer.parseInt(br.readLine());
+		dp = new long[N+1];
+		
+	}
+	
+	static void solve() throws Exception{
+		
+		dp[1] = 1;
+		for(int i=2;i<=N;i++) dp[i] = (dp[i-1]*3 + dp[i-2] + G[i%6]) % mod;
+		bw.write(dp[N] +"\n");
+		
+	}
+	
+}
+
+```