记录编号	433685	评测结果	AAAAAAAAAA
题目名称	膜拜神犇	最终得分	100
用户昵称	Cooook	是否通过	通过
代码语言	C++	运行时间	0.269 s
提交时间	2017-08-05 19:19:34	内存使用	0.31 MiB

#include <bits/stdc++.h>
using namespace std;
int n,Ans;


struct Point{
    int x,y;
    inline void in(){scanf("%d%d",&x,&y);}
    Point(int _,int __){x=_;y=__;}
    Point(){}
};

inline Point operator - (Point a,Point b){return (Point){a.x-b.x,a.y-b.y};}
inline int Cross(Point a,Point b){return a.x*b.y-a.y*b.x;}

int main(){
    freopen("trioxorz.in","r",stdin);
    freopen("trioxorz.out","w",stdout);
    scanf("%d",&n);
    Point Cooook(0,0);
    for(int i=1;i<=n;i++){
        Point LadyLex,TS_Hugh,Ren_Ivan;
        LadyLex.in();
        TS_Hugh.in();
        Ren_Ivan.in();
        int Ans1=Cross(TS_Hugh-LadyLex,Cooook-LadyLex);
        int Ans2=Cross(Ren_Ivan-TS_Hugh,Cooook-TS_Hugh);
        int Ans3=Cross(LadyLex-Ren_Ivan,Cooook-Ren_Ivan);
        if(Ans1>0&&Ans2>0&&Ans3>0)Ans++;
        if(Ans1<0&&Ans2<0&&Ans3<0)Ans++;
    }
    printf("%d\n",Ans);
}