ZOJ 3488 Conic Section

这种题都不会可以滚回高中了好吗？！

比赛结束前十秒get了这张图。。

#include <iostream>
#include <algorithm>
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <queue>
#include <cmath>
#include <stack>

#pragma comment(linker, "/STACK:1024000000");
#define EPS (1e-8)
#define LL long long int
#define ULL unsigned long long int
#define _LL __int64
#define _INF 0x3f3f3f3f
#define INF 4000000
#define Mod 1000000009

using namespace std;

int main()
{
    double a,b,c,d,e,f;

    int T;

    cin>>T;

    while(T--)
    {

        cin>>a>>b>>c>>d>>e>>f;

        if(b*b-4*a*c < 0)
        {
            if(a == c && b == 0 && d*d+e*e-4*f > 0)
                cout<<"circle"<<endl;
            else
                cout<<"ellipse"<<endl;
        }
        else if(b*b-4*a*c == 0)
        {
            cout<<"parabola"<<endl;
        }
        else if(b*b-4*a*c > 0)
        {
            cout<<"hyperbola"<<endl;
        }
    }

    return 0;
}