63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
#include <cstdio>
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#include <cstring>
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#include <algorithm>
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#include <cmath>
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#include <cstdlib>
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using namespace std;
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struct point{
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int x, y;
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point() {}
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point(int a, int b) : x(a), y(b){}
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void input(){
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scanf("%d%d", &x, &y);
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}
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friend point operator - (const point &a, const point &b){
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return point(a.x - b.x, a.y - b.y);
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}
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friend bool operator < (const point &a, const point &b){
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return a.x < b.x;
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}
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};
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const int maxn = 200 + 10, maxm = 500 + 10;
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point po[maxn], mi[maxm];
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int det(point a, point b){
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return a.x * b.y - a.y * b.x;
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}
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int num[maxn][maxn];
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int n, m, cs;
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void init(point a, point b, int &cnt){
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int x1 = a.x, x2 = b.x;
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for (int i = 0; i < m; i++)
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if (mi[i].x >= x1 && mi[i].x < x2)
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if (det(mi[i] - a, b - a) > 0)
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cnt += 1;
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}
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int main(){
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scanf("%d", &cs);
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for (int kase = 1; kase <= cs; ++kase){
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scanf("%d%d", &n, &m);
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for (int i = 0; i < n; i++)
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po[i].input();
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for (int i = 0; i < m; i++)
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mi[i].input();
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sort(po, po + n);
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for (int i = 0; i < n; i++)
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for (int j = i + 1; j < n; j++)
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init(po[i], po[j], num[i][j] = 0);
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printf("Case #%d: ", kase);
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double ans = -1;
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for (int i = 0; i < n; i++)
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for (int j = i + 1; j < n; j++)
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for (int k = j + 1; k < n; k++){
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int cnt = num[i][k] - num[i][j] - num[j][k];
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if (!cnt) continue;
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double area = det(po[j] - po[i], po[k] - po[i]) / 2.0;
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double tmp = area / (double)cnt;
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if (ans == -1 || ans > tmp) ans = tmp;
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}
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if (ans == -1) puts("-1");
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else printf("%.6lf\n", ans);
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}
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return 0;
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}
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