Submission #1278817

#	Time	Username	Problem	Language	Result	Execution time	Memory
1278817		k12_khoi	Balloons (CEOI11_bal)	C++17	100 / 100	97 ms	6688 KiB

bal

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

#define ll long long
#define ld long double

const int N=2e5+5;

int n,u,v;
ll x[N];
ld y[N];
stack <int> st;

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

    cin >> n;
    for (int i=1;i<=n;i++)
    {
        cin >> u >> v;

        x[i]=u;
        ld best=v;

        while (!st.empty())
        {
            int j=st.top();

            best=min(best,(x[i]-x[j])*(x[i]-x[j])/(4*y[j]));
            if (best>=y[j]) st.pop();
            else break;
        }
        y[i]=best;
        st.push(i);
    }

    cout << fixed << setprecision(3);
    for (int i=1;i<=n;i++)
    cout << y[i] << '\n';
}

• 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