Submission #954458

#	Time	Username	Problem	Language	Result	Execution time	Memory
954458		koukirocks	Sure Bet (CEOI17_sure)	C++17	100 / 100	158 ms	8880 KiB

sure

#include <bits/stdc++.h>
#define speed ios_base::sync_with_stdio(0); cin.tie(0)
#define all(x) (x).begin(),(x).end()
#define F first
#define S second
//#pragma GCC optimize("O3")
//#pragma GCC target("avx,avx2")
//#pragma GCC target("popcnt")
 
namespace{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=1e5+10,P=1e9+7;
const ll INF=0x3f3f3f3f,oo=0x3f3f3f3f3f3f3f3f;
const ldb eps=1e-6;

int n;
vector<ldb> a,b;
vector<ldb> pa,pb;

ldb w(int l,int r) {
	return min(pa[l],pb[r]);
}

int main() {
//	speed;
	cin>>n;
	for (int i=1;i<=n;i++) {
		ldb x,y;
		cin>>x>>y;
		a.push_back(x);
		b.push_back(y);
	}
	auto cmp=[&](ldb a,ldb b) {
		return a>b;
	};
	sort(all(a),cmp);
	sort(all(b),cmp);
	pa.resize(n+1);
	pb.resize(n+1);
	pa[0]=0;
	pb[0]=0;
	for (int i=1;i<=n;i++) {
		pa[i]=pa[i-1]+a[i-1];
		pb[i]=pb[i-1]+b[i-1];
	}
	ldb ans=0;
	for (int i=1;i<=2*n;i++) {
//		cout<<i<<" i\n"<<flush;
		int l=max(0,i-n),r=min(i,n);
		while (l<r) {
			int m1=(2*l+r)/3;
			int m2=(l+2*r+1)/3;
//			cout<<l<<" "<<m1<<" "<<m2<<" "<<r<<"\n"<<flush;
			if (w(m1,i-m1)<w(m2,i-m2)) l=m1+1;
			else r=m2-1;
		}
//		cout<<l<<" "<<i-l<<" "<<w(i,i-l)<<"\n";
		ans=max(ans,w(l,i-l)-i);
	}
	printf("%.4lf",(double)ans);
	return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40