Submission #1258083

#	Time	Username	Problem	Language	Result	Execution time	Memory
1258083		chikien2009	Let's Win the Election (JOI22_ho_t3)	C++20	100 / 100	100 ms	448 KiB

Main

#include <bits/stdc++.h>

using namespace std;

void setup()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

int n, m;
double f[501], res = 1e18;
pair<int, int> p[501];

int main()
{
    setup();

    cin >> n >> m;
    for (int i = 0; i < n; ++i)
    {
        cin >> p[i].second >> p[i].first;
        p[i].first = (p[i].first == -1 ? 1e9 : p[i].first);
    }
    sort(p, p + n);
    for (int i = 0; i < m; ++i)
    {
        fill_n(f, m + 1, 1e18);
        f[0] = 0;
        for (int j = 0; j < n; ++j)
        {
            for (int k = m - i, x; k >= 0; --k)
            {
                if (k < m - i)
                {
                    f[k + 1] = min(f[k + 1], f[k] + (double)p[j].second / (i + 1));
                }
                x = j - k + 1;
                if (0 < x && x <= i)
                {
                    f[k] += (double)p[j].first / x;
                }
            }
        }
        res = min(res, f[m - i]);
    }
    cout << fixed << setprecision(6) << res;
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12
• Subtask 5: 33 / 33
• Subtask 6: 11 / 11
• Subtask 7: 23 / 23