Submission #914981

#	Time	Username	Problem	Language	Result	Execution time	Memory
914981		Em1L	Mobile (BOI12_mobile)	C++14	0 / 100	966 ms	16720 KiB

mobile

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

using ll = long long;
using pii = pair<int, int>;
using tiiii = tuple<int, int, ll, ll>;

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);

    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 Good = [&](double dist) {
        double r = 0;

        for (int i = 0; i < n; i++) {
            if (y[i] > dist)
                continue;

            double left = x[i] - sqrtl(dist * dist - y[i] * y[i]);
            double right = x[i] + sqrtl(dist * dist - y[i] * y[i]);

            if (r < left)
                return false;

            r = max(r, right);
        }

        return r > L;
    };

    double l = 0, m, r = 2e+9;

    for (int i = 0; i < 100; i++) {
        m = (l + r) / 2;

        if (Good(m))
            r = m;
        else
            l = m;
    }

    cout << setprecision(16) << fixed << r << "\n";
}

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