Submission #649534

#	Time	Username	Problem	Language	Result	Execution time	Memory
649534		parsadox2	Balloons (CEOI11_bal)	C++14	100 / 100	565 ms	9304 KiB

bal

#include <bits/stdc++.h>

using namespace std;

const int maxn = 2e5 + 10;

int x[maxn] , n;
long double r[maxn];
vector <int> st;

void f(int ps)
{
    int j = st.back();
    long double tmp = 1.0 * (x[ps] - x[j]) / (1.0 * 4 * r[j]);
    tmp = 1.0 * tmp * (x[ps] - x[j]);
    r[ps] = min(r[ps] , tmp);
}

int main()
{
    cin >> n;
    for(int i = 0 ; i < n ; i++)
        cin >> x[i] >> r[i];

    for(int i = 0 ; i < n ; i++)
    {
        while(!st.empty())
        {
            f(i);
            if(r[i] >= r[st.back()])
                st.pop_back();
            else
                break;
        }
        st.push_back(i);
    }
    for(int i = 0 ; i < n ; i++)
        cout << setprecision(3) << fixed << r[i] << endl;
    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