Create BJ_1563_개근상.java

Author: kn9012

250428/BJ_1563_개근상.java

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+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+/**
+ * 백준 1563번 개근상
+ * - dp 사용
+ */
+ 
+public class Main {
+	static final int MOD = 1000000;  
+	public static void main(String[] args) throws IOException {
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+		int N = Integer.parseInt(br.readLine());
+		
+		int[][][] dp = new int[N][2][3];
+		dp[0][0][0] = 1; // 출석
+		dp[0][1][0] = 1; // 지각
+		dp[0][0][1] = 1; // 결석
+		
+		for (int i = 1; i < N; i++) {
+			for (int j = 0; j < 2; j++) {
+				for (int k = 0; k < 3; k++) {
+					int value = dp[i - 1][j][k];
+					
+					// 출석
+					dp[i][j][0] = (dp[i][j][0] + value) % MOD;
+					
+					// 지각
+					if (j == 0) dp[i][1][0] = (dp[i][1][0] + value) % MOD;
+					
+					// 결석
+					if (k < 2) dp[i][j][k + 1] = (dp[i][j][k + 1] + value) % MOD;
+				}
+			}
+		}
+		
+		int answer = 0;
+		for (int i = 0; i < 2; i++) {
+			for (int j = 0; j < 3; j++) {
+				answer = (answer + dp[N - 1][i][j]) % MOD;
+			}
+		}
+		
+		System.out.println(answer);
+	}
+}