Submission #448357

#	Time	Username	Problem	Language	Result	Execution time	Memory
448357		four_specks	Balloons (CEOI11_bal)	C++17	20 / 100	237 ms	9948 KiB

bal

#include <bits/stdc++.h>

using namespace std;

double dist(const double &x1, const double &y1, const double &x2)
{
    double dx = (x2 - x1);
    return dx * dx / (4 * y1);
}

void solve()
{
    struct elem
    {
        double x, r;
    };

    int n;
    cin >> n;

    vector<elem> a(n);
    for (int i = 0; i < n; i++)
        cin >> a[i].x >> a[i].r;

    vector<double> radii(n);

    stack<int> st;
    for (int i = 0; i < n; i++)
    {
        if (st.empty())
        {
            st.emplace(i);
            radii[i] = a[i].r;
        }
        else
        {
            double sz = a[i].r;
            while (!st.empty())
            {
                int u = st.top();
                sz = min(sz, dist(a[u].x, radii[u], a[i].x));
                if (sz >= a[u].r)
                    st.pop();
                else
                    break;
            }

            st.emplace(i);
            radii[i] = sz;
        }
    }

    cout << fixed << setprecision(3);
    for (int i = 0; i < n; i++)
        cout << radii[i] << '\n';
}

int main()
{
    ios_base::sync_with_stdio(false), cin.tie(NULL);

    solve();

    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10