[20251016] BOJ / G5 / 사과나무 / 김수연

Author: suyeun84

suyeun84/202510/16 BOJ G5 사과나무.md

@@ -0,0 +1,33 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class boj20002 {
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static StringTokenizer st;
+    static void nextLine() throws Exception { st = new StringTokenizer(br.readLine()); }
+    static int nextInt() { return Integer.parseInt(st.nextToken()); }
+
+    public static void main(String[] args) throws Exception {
+        nextLine();
+        int N = nextInt();
+        int[][] arr = new int[N+1][N+1];
+        int answer = -1000*300*300-1;
+        for (int i = 1; i <= N; i++) {
+            nextLine();
+            for (int j = 1; j <= N; j++) {
+                int tmp = nextInt();
+                arr[i][j] = tmp + arr[i-1][j] + arr[i][j-1] - arr[i-1][j-1];
+            }
+        }
+        for (int k = 1; k <= N; k++) {
+            for (int i = k; i <= N; i++) {
+                for (int j = k; j <= N; j++) {
+                    answer = Math.max(answer, arr[i][j] - arr[i][j-k] - arr[i-k][j] + arr[i-k][j-k]);
+                }
+            }
+        }
+        System.out.println(answer);
+    }
+}
+```