Submission #933366

#	Time	Username	Problem	Language	Result	Execution time	Memory
933366		koukirocks	Let's Win the Election (JOI22_ho_t3)	C++17	10 / 100	6 ms	8792 KiB

Main

#include <bits/stdc++.h>
#define speed ios_base::sync_with_stdio(0); cin.tie(0)
#define all(x) (x).begin(),(x).end()
 
using namespace std;
typedef long long ll;
typedef double db;
typedef long double ldb;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
 
const ll MAX=5e2+10,P=998244353;
const ll INF=0x3f3f3f3f,oo=0x3f3f3f3f3f3f3f3f;

ll n,k;
pair<ldb,ldb> vt[MAX];
ldb dp[MAX][MAX];
ldb suf[MAX][MAX];

int main() {
	speed;
	cin>>n>>k;
	for (int i=1;i<=n;i++) {
		cin>>vt[i].first>>vt[i].second;
		if (vt[i].second==-1) vt[i].second=oo;
	}
	sort(vt+1,vt+n+1,[=](pair<ldb,ldb> a,pair<ldb,ldb> b){
		if (a.second==b.second) return a.first>b.first;
		return a.second<b.second;
	});
	memset(suf,0,sizeof(suf));
	for (int i=1;i<=k;i++) {
		dp[0][i]=oo;
		suf[n+1][i]=oo;
	}
	dp[0][0]=0;
	for (int i=1;i<=n;i++) {
		dp[i][0]=0;
		for (int j=1;j<=k;j++) {
			dp[i][j]=min(dp[i-1][j-1]+vt[i].second/j,dp[i-1][j]);
//			cout<<dp[i][j]<<" ";
		}
//		cout<<"\n";
	}
	suf[n+1][0]=0;
	for (int i=n;i>=0;i--) {;
		suf[i][0]=0;
		for (int j=k;j>=1;j--) {
			suf[i][j]=min(suf[i+1][j-1]+vt[i].first,suf[i+1][j]);
//			cout<<i<<" "<<j<<" "<<suf[i+1][j-1]+vt[i].first<<" "<<suf[i+1][j]<<" "<<suf[i][j]<<" suf\n";
		}
	}
	ldb ans=oo;
	for (int i=0;i<=n;i++) {
		for (int j=k;j>=0;j--) {
			ans=min(ans,dp[i][j]+suf[i+1][k-j]/(j+1));
//			cout<<i<<" "<<j<<" "<<dp[i][j]<<" "<<suf[i+1][k-j]<<"\n";
		}
//		cout<<"\n";
	}
	cout<<fixed<<setprecision(20)<<ans<<"\n";
	return 0;
}

• 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