Submission #933335

#	Time	Username	Problem	Language	Result	Execution time	Memory
933335		koukirocks	Let's Win the Election (JOI22_ho_t3)	C++17	10 / 100	13 ms	4696 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];

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

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:50:11: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long double>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |    if (k-j>=rest.size()) break;
      |        ~~~^~~~~~~~~~~~~

• 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