120SGU

#include <iostream>
#include <cmath>
#include <complex>
#include <iomanip>

using namespace std;

typedef complex<double> point;

const int maxn = 200;
const double pi = acos(-1);

int n, n1, n2;
point a, b, center;
double r;
point ans[maxn];

void calc();
void rot();

int main() {
    ios :: sync_with_stdio(false);
    cin >> n >> n1 >> n2;
    n1--, n2--;
    double x, y;
    cin >> x >> y;
    a = point(x, y);
    cin >> x >> y;
    b = point(x, y);

    if (a == b) {
        for (int i = 0; i < n; i++)
            cout << real(a) << " " << imag(a) << '\n';
        return 0;
    }

    calc();
    a -= center;
    for (int i = 0; i < n; i++) {
        ans[n1] = a + center;
        rot();
        n1--;
        if (n1 < 0)
            n1 += n;
    }

    for (int i = 0; i < n; i++)
        cout << setprecision(6) << fixed << real(ans[i]) << " " << imag(ans[i]) << '\n';

    return 0;
}

void calc() {
    double dis = abs(b - a);
    double z = (2 * pi) / n;
    z *= (max(n2, n1) - min(n2, n1));
    z /= 2;
    r = dis / sin(z);
    r /= 2;
    z *= 2;
    //if (z > pi)
    //  swap(a, b), c = true;
    z = (z - pi) / 2;
    double len = r / dis;
    center = (b - a) * point(len * cos(z), len * sin(z)) + a;
}

void rot() {
    double z = (2 * pi) / n;
    a = a * point(cos(z),  sin(z));
}