ZOJ 3919Ellipse(数学)

给出一个椭圆，要求算与圆心在原点的圆相切 且四个点都在椭圆上的平行四边形的最大和最小面积

#include<iostream>#include<cstdio>#include<cmath>#include<functional>#include<set>#include <cstring>#include <string>#include <algorithm>#include <cstdlib>#include <queue>#include <set>#include <map>#include <stack>#include<cctype>#include<sstream>#include<vector>#include <ctime>using namespace std;#define sp system("pause")#define PI acos(-1.0)typedef long long ll;#define iin(x) scanf("%d",&x)#define mst(x,y) memset(x,y,sizeof(x))int main(){ll a,b;while(cin>>a>>b){cout<<2*a*b<<" ";printf("%.6f\n",4.0*a*a/(a*a+b*b)*b*b);}return 0;}