Submission #807020

#	Time	Username	Problem	Language	Result	Execution time	Memory
807020		tlnk07	Odašiljači (COCI20_odasiljaci)	C++17	70 / 70	340 ms	340 KiB

odasiljaci

#include<bits/stdc++.h>
using namespace std;
#define int long long

long long n, p[1001], limit = 100;
double l = 0, r = 1e9;
pair<int, int> a[1001];

int findparent(int x)
{
	if(x == p[x])	return x;
	else	return p[x] = findparent(p[x]);
}

bool check(double x)
{
	for(int i = 1; i <= n; ++i)	p[i] = i;
	for(int i = 1; i <= n; ++i)
	{
		for(int j = 1; j <= n; ++j)
		{
			double temp = (a[i].first - a[j].first) * (a[i].first - a[j].first) + (a[i].second - a[j].second) * (a[i].second - a[j].second);
			if(sqrt(temp) < x * 2)
			{
				long long a = findparent(i), b = findparent(j);
				p[a] = p[b];
			}
		}
	}
	p[1] = findparent(1);
	for(int i = 2; i <= n; ++i)	if(findparent(i) != p[1])	return 0;
	return 1;
}

signed main()
{
	cin >> n;
	for(int i = 1; i <= n; ++i)	cin >> a[i].first >> a[i].second;
	while(l < r && limit--)
	{
		double mid = (l + r) / 2;
		if(!check(mid))	l = mid;
		else	r = mid;
	}
	cout << fixed << setprecision(7) << l;
}

• Subtask 1: 70 / 70