HDU-6080 度度熊保护村庄

https://vjudge.net/solution/31950692

vjudge/problem/HDU/6080/6080.cpp

@@ -0,0 +1,69 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int n, m, ans, dp[505][505];
+
+struct node {
+    int x, y;
+
+    node() {}
+    node(int _x, int _y) {
+        x = _x;
+        y = _y;
+    }
+    node operator-(node B) {
+        return node(x - B.x, y - B.y);
+    }
+} hou[505], fri[505];
+
+inline int det(node A, node B) {
+    return A.x * B.y - A.y * B.x;
+}
+
+int main() {
+    while (cin >> n) {
+        for (int i = 1; i <= n; i++) {
+            cin >> hou[i].x >> hou[i].y;
+        }
+        cin >> m;
+        for (int i = 1; i <= m; i++) {
+            cin >> fri[i].x >> fri[i].y;
+        }
+        for (int i = 1; i <= m; i++) {
+            for (int j = 1; j <= m; j++) {
+                dp[i][j] = -1;
+                if (i == j) continue;
+                bool ok = true;
+                for (int k = 1; k <= n; k++)
+                    if (det(hou[k] - fri[i], fri[j] - fri[i]) > 0) {
+                        ok = false;
+                        break;
+                    }
+                if (ok) {
+                    dp[i][j] = 1;
+                }
+            }
+        }
+        for (int k = 1; k <= m; k++) {
+            for (int i = 1; i <= m; i++) {
+                if (dp[i][k] == -1) continue;
+                for (int j = 1; j <= m; j++) {
+                    if (dp[k][j] == -1) continue;
+                    dp[i][j] = dp[i][j] == -1 ? dp[i][k] + dp[k][j] : min(dp[i][j], dp[i][k] + dp[k][j]);
+                }
+            }
+        }
+        ans = -1;
+        for (int i = 1; i <= m; i++) {
+            if (dp[i][i] == -1) continue;
+            ans = ans == -1 ? dp[i][i] : min(ans, dp[i][i]);
+        }
+        if (ans == -1) {
+            cout << "ToT" << endl;
+        } else {
+            cout << m - ans << endl;
+        }
+    }
+    return 0;
+}