Submission #1182730

#	Time	Username	Problem	Language	Result	Execution time	Memory
1182730		william889	Let's Win the Election (JOI22_ho_t3)	C++20	100 / 100	104 ms	476 KiB

Main

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

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	int n, k;
	cin >> n >> k;
	vector<pair<double, double>> v(n);
	for (int i = 0; i < n; i++) {
		cin >> v[i].second >> v[i].first;
		if (v[i].first == -1) v[i].first = 1e9;
	}
	sort(v.begin(), v.end());

	double ans = 2e18;

	for (int c = 0; c < k; c++) {
		int mx = k - c;
		vector<double> dp(mx + 1, 1e18);
		dp[0] = 0;
		for (int i = 0; i < n; i++) {
			for (int e = mx; e >= 0; e--) {
				if (e != mx) dp[e + 1] = min(dp[e + 1], dp[e] + v[i].second / (1.0 + c));
				int id = i + 1 - e;
				if (id <= 0) continue;
				if (id <= c) dp[e] += v[i].first / (double)id;
			}
		}
		ans = min(ans, dp[mx]);
	}
	cout << fixed << setprecision(9) << ans << "\n";
	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