#include <bits/stdc++.h>

using namespace std;

int main() {
	int n;
	float x[100], y[100];
	float dist, max_dist = 0;
	int pos1, pos2;
	cout<<"Nhap n: "; cin>>n;
	for (int i = 0; i < n; i++) {
		cout<<"Nhap x["<<i<<"]: ";
		cin>>x[i];
		cout<<"Nhap y["<<i<<"]: ";
		cin>>y[i];
	}
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			dist = sqrt(pow(x[j] - x[i], 2) + pow(y[j] - y[i], 2));
			if (dist > max_dist) {
				max_dist = dist;
				pos1 = i;
				pos2 = j;
			}
		}
	}
	cout<<"Toa do 2 diem xa nhat la: ("<<x[pos1]<<","<<y[pos1]<<") va ("<<x[pos2]<<","<<y[pos2]<<")"<<endl;
	cout<<"Khoang cach: "<<max_dist;
	return 0;
}