oj.uz

Submission #496400

# Submission time Handle Problem Language Result Execution time Memory
496400 2021-12-21T07:27:25 Z kappa Odašiljači (COCI20_odasiljaci) C++14
70 / 70
 102 ms 368 KB 
#include <bits/stdc++.h>

using namespace std;

int n, say, vis[1005];

double lo = 0, hi = 1e9, lim = 1e-7;

pair<int, int> antenna[1005];

long long uzaklik(pair<int, int> a, pair<int, int> b){
    return (long long) abs(a.first - b.first) * abs(a.first - b.first) + (long long) abs(a.second - b.second) * abs(a.second - b.second);
}

void gez(int ind, double r){
    vis[ind] = 1;
    say++;

    for (int i = 0; i < n; i++)
    {
        if(i != ind && vis[i] == 0 && r * r * 4 > (long long) uzaklik(antenna[ind], antenna[i])){
            gez(i, r);
        }
    }
}

bool check(double r){
    memset(vis, 0, sizeof(vis));
    say = 0;
    gez(0, r);

    return say == n;
}

int main(){
    cin >> n;

    for (int i = 0; i < n; i++)
    {
        int x, y;

        cin >> x >> y;

        antenna[i].first = x;
        antenna[i].second = y;
    }

    while(hi - lo > lim){
        double mid = (hi + lo) / 2;

        if(check(mid)){
            hi = mid;
        }else{
            lo = mid;
        }
    }

    cout.precision(7);
    cout << fixed << lo;
    //printf("%.7lf", lo);
}

Subtask #1
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 2 ms 204 KB Output is correct
6 Correct 13 ms 292 KB Output is correct
7 Correct 26 ms 332 KB Output is correct
8 Correct 41 ms 296 KB Output is correct
9 Correct 102 ms 368 KB Output is correct
10 Correct 90 ms 332 KB Output is correct