Submission #464196

#	Time	Username	Problem	Language	Result	Execution time	Memory
464196		dqk	Mobile (BOI12_mobile)	C++17	65 / 100	834 ms	55108 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 = 0.0, hi = 3e9;
    while(hi - lo > 1e-6) {
        double mi = lo + (hi - lo) / 2;
        double cur = 0.0;
        for (int i = 0; i < n; ++i) {
            double d = sqrt(mi * mi - 1ll * p[i][1] * p[i][1]);
            if (cur >= p[i][0] - d)
                cur = std::max(cur, p[i][0] + d);
        }
        if (cur >= L) {
            hi = mi;
        }
        else {
            lo = mi;
        }
    }
    std::cout << std::setprecision(10) << lo << "\n";
    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 4 / 4
• Subtask 4: 4 / 4
• Subtask 5: 4 / 4
• Subtask 6: 5 / 5
• Subtask 7: 5 / 5
• Subtask 8: 5 / 5
• Subtask 9: 5 / 5
• Subtask 10: 0 / 5
• Subtask 11: 5 / 5
• Subtask 12: 0 / 5
• Subtask 13: 5 / 5
• Subtask 14: 0 / 5
• Subtask 15: 0 / 5
• Subtask 16: 0 / 5
• Subtask 17: 5 / 5
• Subtask 18: 0 / 5
• Subtask 19: 5 / 5
• Subtask 20: 0 / 5
• Subtask 21: 5 / 5