제출 #464193

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
464193		dqk	Mobile (BOI12_mobile)	C++17	100 / 100	831 ms	74424 KiB

mobile

#include <bits/stdc++.h>

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int n;
    double L;
    std::cin >> n >> L;
    std::vector<std::vector<int>> p(n, std::vector<int>(2, 0));
    for (int i = 0; i < n; ++i) {
        std::cin >> p[i][0] >> p[i][1];
    }
    sort(p.begin(), p.end());
    double lo = 0.00, hi = 4e9;
    while(hi - lo > 1e-6) {
        double mi = lo + (hi - lo) / 2;
        double cur = 0.00;
        for (int i = 0; i < n; ++i) {
            double d = sqrt(mi * mi - (1.00 * 1ll * p[i][1]) * (1.00 * 1ll * p[i][1]));
            if (cur >= (1.00 * p[i][0] - d))
                cur = std::max(cur, 1.00 * p[i][0] + d);
        }
        if (cur >= L) {
            hi = mi;
        }
        else {
            lo = mi;
        }
    }
    printf("%.6lF", lo);
    //std::cout << lo << "\n";
    return 0;
}

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