'commit'

TangDou/CSP-J/AcWingTraining/T6/126_ErWei.cpp

@@ -0,0 +1,32 @@
+#include <bits/stdc++.h>
+using namespace std;
+const int INF = 0x3f3f3f3f;
+const int N = 110;
+int g[N][N];
+
+int main() {
+    int n;
+    cin >> n;
+    for (int i = 1; i <= n; i++)
+        for (int j = 1; j <= n; j++) {
+            cin >> g[i][j];
+            // 累加出并记录同一列的前缀和
+            g[i][j] += g[i - 1][j];
+        }
+
+    int res = -INF;
+
+    // 枚举边界1，2
+    for (int i = 1; i <= n; i++)       // 起始行
+        for (int j = i; j <= n; j++) { // 终止行
+            // 枚举边界p
+            int last = 0;
+            for (int k = 1; k <= n; k++) {
+                last = max(last, 0) + g[j][k] - g[i - 1][k];
+                res = max(res, last);
+            }
+        }
+
+    cout << res << endl;
+    return 0;
+}