episodul2

#include <fstream>
#define LL long long
using namespace std;
ifstream f("episodul2.in");
ofstream g("episodul2.out");
typedef struct
        {
            int x,y;
        } PUNCT;
PUNCT p[200001];
int vf;

bool cp(PUNCT A,PUNCT B,PUNCT C)
{
    LL v=1LL*(B.y-A.y)*(C.x-A.x)-1LL*(B.x-A.x)*(C.y-A.y);
    return v<0;
}

int main()
{
    int m,ev;
    PUNCT pc;
    LL aria;
    f>>m;
    while(m--)
    {
        f>>ev;
        if(ev==1)
        {
            f>>pc.x>>pc.y;
            while(cp(p[vf-1],p[vf],pc))
                --vf;
            ++vf,p[vf].x=pc.x,p[vf].y=pc.y;
        }
        else
        {
/*
            for(int i=1;i<=vf;++i)
                g<<p[i].x<<"      "<<p[i].y<<endl;
*/
            aria=0;
            for(int i=2;i<=vf;++i)
                aria+=(unsigned long long)(p[i].y+p[i-1].y)*(unsigned long long)(p[i].x-p[i-1].x);
            int rest=aria%2;
            g<<aria/2;
            if(rest==1)
                g<<".5\n";
            else
                g<<'\n';
        }
    }
    return 0;
}