#include<iostream>
#include<fstream>
#include<vector>
#include <cmath>
using namespace std;
float first(vector<pair<int,int>>tmp, int i)
{
return ((tmp[i+1].second - tmp[i].second) / (tmp[i+1].first - tmp[i].first));
}
float Newton(vector<pair<int,int>>tmp, int k, int i)
{
if(k == 0)
{
return 1;
}
if(k == 1)
{
return first(tmp, i);
}
return (Newton(tmp, k - 1, i + 1) - Newton(tmp, k - 1, i)) / (tmp[i+k].first - tmp[i].first);
}
int main()
{
vector<pair<int,int>>tmp;
fstream plik;
plik.open("dane", fstream::in);
if(plik.good())
{
int n;
plik >> n;
cout<<"Ilosc wezlow: "<<n<<endl;
for(int i=0; i<n; i++)
{
int x,y;
plik >> x;
plik >> y;
tmp.push_back(make_pair(x,y));
}
for(int m=0; m<n; m++)
{
cout<<"x: "<<tmp[m].first<<" y:"<<tmp[m].second<<endl;
}
float q;
cin>>q;
float result = tmp[0].second;
float pomocnicza = 0;
for (int i = 0; i < n; i++)
{
pomocnicza = 0;
for (int j = 0; j < i; j++)
{
if (j == 0)
{
pomocnicza = q - tmp[0].first;
}
else
{
pomocnicza *= q - tmp[j].first;
}
}
result += pomocnicza*Newton(tmp,i,0);
}
cout<<result;
}
else
{
cout<<"Fail open"<<endl;
}
return 0;
}
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