Submission #1182745

#	Time	Username	Problem	Language	Result	Execution time	Memory
1182745		william889	Let's Win the Election (JOI22_ho_t3)	C++20	100 / 100	102 ms	480 KiB

Main

# include<bits/stdc++.h>
using namespace std;
#define db double
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 cnt=2e18;
	for(int i=0;i<k;i++){
		int x=k-i;
		vector<double> dp(x+1,1e18);
		dp[0]=0;
		for(int j=0;j<n;j++){
			for(int ii=x ; ii>=0;ii--){
				if(ii!=x) dp[ii+1]=min(dp[ii+1], dp[ii]+v[j].second/(1.0+i));
				int pos=j+1-ii;
				if(pos<=0) continue;
				if(pos<=i) dp[ii]+=v[j].first/(db)pos;
			}
		}
		cnt=min(cnt,dp[x]);
	}
	cout<<fixed<<setprecision(9)<<cnt;
}

• 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