[20260130] BOJ / G3 / 소형기관차 / 이준희

Author: JHLEE325

JHLEE325/202601/30 BOJ G3 소형기관차.md

@@ -0,0 +1,35 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st;
+
+        int N = Integer.parseInt(br.readLine());
+
+        int[] train = new int[N + 1];
+        int[] sum = new int[N + 1];
+
+        st = new StringTokenizer(br.readLine());
+        for (int i = 1; i <= N; i++) {
+            train[i] = Integer.parseInt(st.nextToken());
+            sum[i] = sum[i - 1] + train[i];
+        }
+
+        int K = Integer.parseInt(br.readLine());
+
+        int[][] dp = new int[4][N + 1];
+
+        for (int i = 1; i <= 3; i++) {
+            for (int j = i * K; j <= N; j++) {
+                dp[i][j] = Math.max(dp[i][j - 1], dp[i - 1][j - K] + (sum[j] - sum[j - K]));
+            }
+        }
+
+        System.out.println(dp[3][N]);
+    }
+}
+```