new file: P1003.cpp P1005.cpp P1006.cpp P1007.cpp

2026-07-06 14:04:43 +08:00
parent 2496907fa2
commit 8a71596ea6
4 changed files with 142 additions and 0 deletions
@@ -0,0 +1,31 @@
+#include <cstdio>
+#include <algorithm>
+using namespace std;
+int m, n;
+int a[55][55];
+int f[55][55][55][55];
+int main()
+{
+    scanf("%d %d", &m, &n);
+    for (int i = 1; i <= m; ++i)
+        for (int j = 1; j <= n; ++j)
+            scanf("%d", &a[i][j]);
+    
+    for (int i = 1; i <= m; ++i)
+    {
+        for (int j = 1; j <= n; ++j)
+        {
+            for (int k = 1; k <= m; ++k)
+            {
+                for (int l = 1; l <= n; ++l)
+                {
+                    f[i][j][k][l] = max(max(f[i - 1][j][k - 1][l], f[i][j - 1][k - 1][l]), max(f[i - 1][j][k][l - 1], f[i][j - 1][k][l - 1])) + a[i][j] + a[k][l];
+                    if (i == k && j == l)
+                        f[i][j][k][l] -= a[i][j];
+                }
+            }
+        }
+    }
+    printf("%d\n", f[m][n][m][n]);
+    return 0;
+}