제출 #491765

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
491765		dooompy	Mobile (BOI12_mobile)	C++17	100 / 100	429 ms	35416 KiB

mobile

#include "bits/stdc++.h"

using namespace std;

using ll = long long;

ll x[1000005], y[1000005];

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
//    freopen("", "r", stdin);
//    freopen("", "w", stdout);
    int n, l; cin >> n >> l;
    for (int i = 0; i < n; i++) {
        cin >> x[i] >> y[i];
    }
    double lo = 1, hi = 1.5e9;

    while (hi-lo > 1e-4) {
        double mid = (hi + lo) / 2;
        double t = 0;

        for (int i = 0; i < n; i++) {
            double length = sqrt(mid * mid - y[i] * y[i]);
            double left = x[i] - length;
            double right = x[i] + length;
            if (left <= t) {
                t = max(t, right);
            }
        }

        if (t >= l) {
            hi = mid;
        } else {
            lo = mid;
        }
    }

    cout << fixed << setprecision(10) << lo << "\n";
}

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