POJ 1939

#include<iostream>
#include<iomanip>
#define MAXN 10000
using namespace std;

double point[MAXN][];

int main()
{
    //freopen("acm.acm","r",stdin);
    int num;
    int i;
    while(cin>>num)
    {
        cin>>point[][]>>point[][];
        cout<<num<<" ";
        for(i = ; i < num; ++ i)
        {
            cin>>point[i][]>>point[i][];
            cout<<setiosflags(ios::fixed)<<setprecision()<<(point[i][]+point[i-][])/2.0<<" "<<(point[i][]+point[i-][])/2.0<<" ";
        }
        cout<<setiosflags(ios::fixed)<<setprecision()<<(point[i-][]+point[][])/2.0<<" "<<(point[i-][]+point[][])/2.0<<endl;
    }
}

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