P1652 圆

R41363960

problem/P1652/P1652.cpp

@@ -0,0 +1,29 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+double dis(int x1, int y1, int x2, int y2) {
+    return sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
+}
+
+int main() {
+    int n, x1, y1, x2, y2, ans = 0, x[60], y[60], r[60];
+    cin >> n;
+    for (int i = 0; i < n; i++) {
+        cin >> x[i];
+    }
+    for (int i = 0; i < n; i++) {
+        cin >> y[i];
+    }
+    for (int i = 0; i < n; i++) {
+        cin >> r[i];
+    }
+    cin >> x1 >> y1 >> x2 >> y2;
+    for (int i = 0; i < n; i++) {
+        if ((dis(x1, y1, x[i], y[i]) < r[i]) ^ (dis(x2, y2, x[i], y[i]) < r[i])) {
+            ans++;
+        }
+    }
+    cout << ans << endl;
+    return 0;
+}