P10719 [GESP202406 五级] 黑白格

https://www.luogu.com.cn/record/174781514

Luogu/P10719/P10719.cpp

@@ -0,0 +1,53 @@
+#include <iostream>
+#include <limits>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 105;
+
+int n, m, k;
+bool g[N][N];
+int s[N][N];
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n >> m >> k;
+
+    for (int i = 1; i <= n; i++) {
+        std::string s;
+
+        cin >> s;
+
+        for (int j = 1; j <= m; j++) {
+            g[i][j] = s[j - 1] == '1';
+        }
+    }
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = 1; j <= m; j++) {
+            s[i][j] = s[i - 1][j] + s[i][j - 1] - s[i - 1][j - 1] + g[i][j];
+        }
+    }
+
+    int ans = std::numeric_limits<int>::max();
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = 1; j <= m; j++) {
+            for (int k = i; k <= n; k++) {
+                for (int l = j; l <= m; l++) {
+                    if (s[k][l] - s[i - 1][l] - s[k][j - 1] + s[i - 1][j - 1] >= ::k) {
+                        ans = std::min(ans, (k - i + 1) * (l - j + 1));
+                    }
+                }
+            }
+        }
+    }
+
+    cout << (ans == std::numeric_limits<int>::max() ? 0 : ans) << endl;
+
+    return 0;
+}