Submission #1248841

#	Time	Username	Problem	Language	Result	Execution time	Memory
1248841		arashmemar	Let's Win the Election (JOI22_ho_t3)	C++20	56 / 100	2620 ms	492592 KiB

Main

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

const int maxn = 501;

pair <int, int> a[maxn];

float dp[maxn][maxn][maxn];

int main()
{
	cout << setprecision(20);
	int n, k;
	cin >> n >> k;
	for (int i = 1;i <= n;i++)
	{
		cin >> a[i].second >> a[i].first;
		if (a[i].first == -1)
		{
			a[i].first = maxn * maxn * maxn;
		}
	}
	sort(a + 1 , a + n + 1);

	for (int x = 0;x <= n;x++)
	{
		for (int i = 0;i <= n;i++)
		{
			for (int j = 0;j <= n;j++)
			{
				dp[x][i][j] = 1e18;
			}
		}
	}
	dp[0][0][0] = 0;

	float ans = 1e18;

	for (int c = 0;c <= min(k, 300);c++)
	{
		for (int i = 1;i <= n;i++)
		{
			for (int x = 0;x <= min(i, c);x++)
			{
				for (int xp = max(0, k - x - n + i);xp <= min(i - x, k - x);xp++)
				{
					dp[i][x][xp] = dp[i - 1][x][xp];
					if (x + xp > i - 1)
					{
						dp[i][x][xp] = 1e18;
					}
					if (x)
					{
						dp[i][x][xp] = min(dp[i][x][xp], dp[i - 1][x - 1][xp] + (float)a[i].first / x);
					}
					if (xp)
					{
						dp[i][x][xp] = min(dp[i][x][xp], dp[i - 1][x][xp - 1] + (float)a[i].second / (c + 1));
					}
				}
			}
		}
		ans = min(ans, dp[n][c][k - c]);
	}
	cout << ans;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12
• Subtask 5: 33 / 33
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23