Submission #872103

#	Time	Username	Problem	Language	Result	Execution time	Memory
872103		SalihSahin	Odašiljači (COCI20_odasiljaci)	C++17	70 / 70	94 ms	480 KiB

odasiljaci

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

const int N = 1e3 + 5;
const int mod = 1e9+7;

int par[N];

int find(int a){
    if(a == par[a]) return a;
    return par[a] = find(par[a]);
}

bool merge(int a, int b){
    a = find(a);
    b = find(b);
    if(a == b) return 0;

    par[b] = a;
    return 1;
}

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin>>n;
    vector<pair<double, double> > a(n);
    for(int i = 0; i < n; i++){
        cin>>a[i].first>>a[i].second;
    }

    double diff = 1e-7;
    double l = 0, r = 1e10;
    while(l + diff < r){
        double mid = (l + r)/2;

        int g = n;
        for(int i = 0; i < n; i++) par[i] = i;

        for(int i = 0; i < n; i++){
            for(int j = i+1; j < n; j++){
                double dis = sqrt((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(mid * 2 >= dis){
                    g -= merge(i, j);
                }
            }
        }

        if(g == 1){
            r = mid;
        }
        else l = mid;
    }

    printf("%.7f \n", l);
    return 0;
}

• Subtask 1: 70 / 70