Submission #1360141

#	Time	Username	Problem	Language	Result	Execution time	Memory
1360141		dukkha	Balloons (CEOI11_bal)	C++20	100 / 100	68 ms	1884 KiB

bal

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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;

    vector<long long> xs;
    vector<double> rs;

    xs.reserve(n);
    rs.reserve(n);

    cout << fixed << setprecision(3);

    for (int i = 0; i < n; i++) {
        long long x;
        double r;
        cin >> x >> r;

        double cur = r;

        while (!xs.empty()) {
            long long dx = x - xs.back();
            double top_r = rs.back();

            double cand = (double)dx * dx / (4.0 * top_r);
            if (cand < cur) cur = cand;

            if (cur >= top_r) {
                xs.pop_back();
                rs.pop_back();
            } else {
                break;
            }
        }

        xs.push_back(x);
        rs.push_back(cur);

        cout << cur << '\n';
    }

    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10