제출 #1127292

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1127292		classic	Mobile (BOI12_mobile)	C++20	85 / 100	378 ms	15988 KiB

mobile

// mode: short code
/*
practicing..
*/
#include <bits/stdc++.h>

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);
    int n, l;
    std::cin >> n >> l;
    std::vector<std::pair<long long, long long>> p(n);
    for (int i = 0; i < n; i++) {
        std::cin >> p[i].first >> p[i].second;
    }
    double low = 1, high = 1.5e9;
    constexpr double EXP = 1e-3;
    while (high - low > EXP) {
        double mid = (low + high) / 2;
        double cur = 0;
        for (int i = 0; i < n; i++) {
            double del = sqrt(mid * mid - p[i].second * p[i].second);
            double a = p[i].first - del;
            double b = p[i].first + del;
            if (a <= cur) {
                cur = std::max(cur, b);
            }
        }
        if (cur >= l) {
            high = mid;
        } else {
            low = mid;
        }
    }
    std::cout << std::fixed << std::setprecision(3) << low;
    return 0;
}

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