Submission #443128

#	Time	Username	Problem	Language	Result	Execution time	Memory
443128		prvocislo	Balloons (CEOI11_bal)	C++17	100 / 100	247 ms	8132 KiB

bal

// aww geometria !! :)
#include <bits/stdc++.h>
typedef long double ld;
using namespace std;

ld maxr(ld x1, ld r1, ld x2)
{
    ld x = r1, z = x2 - x1;
    return (z * z) / (4. * x);
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0); 
    cout << fixed << setprecision(3);
    int n;
    cin >> n;
    vector<ld> x(n), r(n);
    vector<int> st;
    for (int i = 0; i < n; i++)
    {
        cin >> x[i] >> r[i];
        while (!st.empty())
        {
            r[i] = min(r[i], maxr(x[st.back()], r[st.back()], x[i]));
            if (r[i] > r[st.back()] - 1e-10) st.pop_back();
            else break;
        }
        st.push_back(i);
    }
    for (int i = 0; i < n; i++) cout << r[i] << "\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