Submission #1276226

#	Time	Username	Problem	Language	Result	Execution time	Memory
1276226		namhh	Let's Win the Election (JOI22_ho_t3)	C++20	100 / 100	92 ms	2424 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define pii pair<int,int>
#define fi first
#define se second
const int N = 5e2+5;
int n,k;
double dp[N][N];
pii a[N];
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin >> n >> k;
	for(int i = 1; i <= n; i++){
		cin >> a[i].fi >> a[i].se;
		swap(a[i].fi,a[i].se);
		if(a[i].fi == -1) a[i].fi = 1e9;
	}
	sort(a+1,a+n+1);
	double ans = 1e9;
	for(int t = 0; t <= k; t++){
		int kaori = k-t;
		for(int i = 0; i <= n; i++){
		    for(int j = 0; j <= min(i,kaori); j++) dp[i][j] = 1e9;
	    }
		dp[0][0] = 0;
		for(int i = 1; i <= n; i++){
			for(int j = 0; j <= min(i,kaori); j++){
				if(j > 0) dp[i][j] = min(dp[i][j],dp[i-1][j-1]+(double)a[i].se/(t+1));
				if(i > j && i-j <= t) dp[i][j] = min(dp[i][j],dp[i-1][j]+(double)a[i].fi/(i-j));
				else if(i-j > t) dp[i][j] = min(dp[i][j],dp[i-1][j]);
			}
		}
	    ans = min(ans,dp[n][kaori]);
	}
	cout << fixed << setprecision(18) << ans;
}

• 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