Submission #486290

#	Time	Username	Problem	Language	Result	Execution time	Memory
486290		Nimbostratus	Odašiljači (COCI20_odasiljaci)	C++17	70 / 70	309 ms	8968 KiB

odasiljaci

#include "bits/stdc++.h"
#define endl '\n'
constexpr int maxn = 1005;
constexpr int inf = 1e9;
constexpr int mod = 1e9+7;
using namespace std;
using lint = long long;
using pdd = pair<double, double>;
#define x first
#define y second
double eps = 0.0000001;

int n;
pdd pt[maxn];
vector<int> adj[maxn];
bool vis[maxn];
double r;

void dfs(int u) {
    vis[u] = true;
    for(int v : adj[u]) {
        if(vis[v])
            continue;
        dfs(v);
    }
}

bool inter(pdd& a, pdd& b) {
    double dist = sqrt((b.x - a.x) * (b.x - a.x) + (b.y - a.y) * (b.y - a.y));
    return dist < 2 * r;
}

bool check() {
    for(int i = 0; i < n; i++) {
        vis[i] = false;
        adj[i].clear();
    }
    for(int i = 0; i < n; i++)
        for(int j = 1; j < n; j++)
            if(inter(pt[i], pt[j])) {
                adj[i].push_back(j);
                adj[j].push_back(i);
            }
    dfs(0);
    for(int i = 0; i < n; i++)
        if(!vis[i])
            return false;
    return true;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n;
    for(int i = 0; i < n; i++)
        cin >> pt[i].x >> pt[i].y;
    double lft = 0, rgt = 1e9;
    while(abs(rgt - lft) > eps) {
        r = (lft + rgt) / 2;
        if(check())
            rgt = r;
        else
            lft = r;
    }
    cout << setprecision(9) << fixed << r << endl;
}

• Subtask 1: 70 / 70