Submission #1075300

#	Time	Username	Problem	Language	Result	Execution time	Memory
1075300		vjudge1	Mobile (BOI12_mobile)	C++17	0 / 100	1099 ms	57008 KiB

mobile

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

#define dbg(x) cerr << #x << " = " << x << endl
#define raya cerr << string(20, '=') << endl
#define pv(x) cerr << #x << "[] : "; for (auto e:x) cerr << e << " "; cerr << endl

#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define eb emplace_back
#define ff first
#define ss second

typedef long long ll;

int main() {
    ios_base::sync_with_stdio(NULL);
    cin.tie(nullptr);

    int n,L;
    cin >> n >> L;
    vector<int> x(n), y(n);
    for (int i = 0; i < n; i++) cin >> x[i] >> y[i];
 
    auto p = [&](double r) -> bool {
        vector<pair<double,double>> I;
        for (int i = 0; i < n; i++) {
            double d = r * r - 1ll * y[i] * y[i];
            if (d < 0) continue;
            d = sqrt(d);
            double x1 = x[i] - d;
            double x2 = x[i] + d;
            x1 = max(x1, 0.0);
            x2 = min(x2, (double)L);
            I.emplace_back(x1,x2);
        }
        sort(all(I));
        for (int i = 0; i < sz(I) - 1; i++) {
            if (I[i].ss > I[i + 1].ff) return 0;
        }       
        return 1;
    };
    double lo = 0, hi = 4e9;
    for (int i = 0; i < 200; i++) {
        double mid = lo + (hi - lo) / 2;
        if (p(mid)) lo = mid;
        else hi = mid;
    }
    cout << fixed << setprecision(6);
    cout << lo << '\n';

    return 0;
}

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