Merge pull request #1855 from AlgorithmWithGod/JHLEE325

[20260129] BOJ / G4 / 개근상 / 이준희

Author: ShinHeeEul

JHLEE325/202601/29 BOJ G4 개근상.md

@@ -0,0 +1,45 @@
+```java
+import java.util.*;
+import java.io.*;
+
+public class Main {
+    
+    static int MOD = 1000000;
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int N = Integer.parseInt(br.readLine());
+
+        int[][][] dp = new int[N + 1][2][3];
+
+        dp[0][0][0] = 1;
+
+        for (int i = 0; i < N; i++) {
+            for (int j = 0; j < 2; j++) {
+                for (int k = 0; k < 3; k++) {
+                    if (dp[i][j][k] == 0) continue;
+
+                    dp[i + 1][j][0] = (dp[i + 1][j][0] + dp[i][j][k]) % MOD;
+
+                    if (j + 1 < 2) {
+                        dp[i + 1][j + 1][0] = (dp[i + 1][j + 1][0] + dp[i][j][k]) % MOD;
+                    }
+
+                    if (k + 1 < 3) {
+                        dp[i + 1][j][k + 1] = (dp[i + 1][j][k + 1] + dp[i][j][k]) % MOD;
+                    }
+                }
+            }
+        }
+
+        int ans = 0;
+        for (int j = 0; j < 2; j++) {
+            for (int k = 0; k < 3; k++) {
+                ans = (ans + dp[N][j][k]) % MOD;
+            }
+        }
+
+        System.out.println(ans);
+    }
+}
+```