Submission #923370

#	Time	Username	Problem	Language	Result	Execution time	Memory
923370		goodspeed0208	Let's Win the Election (JOI22_ho_t3)	C++14	10 / 100	570 ms	1018984 KiB

Main

#include<bits/stdc++.h>
#define pii pair<int, int>
#define INF 5000000
using namespace std;

bool cmp(pii a, pii b) {
	if (a.second == -1 || b.second == -1) return a.second != -1;
	return a.second < b.second;
}

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n, K;
	cin >> n >> K;
	vector<pii>v(n+1);
	vector<double>a(n+1), b(n+1);
	for (int i = 1 ; i <=  n ;i++) cin >> v[i].first >> v[i].second;
	sort(v.begin()+1, v.end(), cmp);
	for (int i = 1 ; i <= n ;i++) a[i] = (double)v[i].first, b[i] = (double)v[i].second;
	
	vector<vector<vector<double> > >dp(505, vector<vector<double> >(505, vector<double>(505, INF)) );
	//double dp[505][505][505];
	dp[0][0][1] = 0.0;
	double ans = INF;
	for (int i = 1 ; i <= n ; i++) {//first i people
	//cout << i << ": \n";
		for (int j = 0 ; j <= i ; j++) {// have how many people
			//cout << j << ": ";
			for (int k = 1 ; k <= j+1 ; k++) {// get how many people
				dp[i][j][k] = dp[i-1][j][k];
				if (j > 0) dp[i][j][k] = min(dp[i][j][k], dp[i-1][j-1][k] + (a[i] / k));
				if (k > 1 && b[i] != -1) dp[i][j][k] = min(dp[i][j][k], dp[i-1][j-1][k-1] + b[i] / (k-1));
				//cout << dp[i][j][k] <<" ";
				if (j >= K) ans = min(ans, dp[i][j][k]);
			}
			//cout << "\n";
		}
	}
	cout << fixed << setprecision(6) << ans << "\n";
	//for (auto &i : v) cout << i.first <<" " << i.second << "\n";
}

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