Submission #938334

#	Time	Username	Problem	Language	Result	Execution time	Memory
938334		vjudge1	Sure Bet (CEOI17_sure)	C++17	0 / 100	1 ms	348 KiB

sure

#include "bits/stdc++.h"
 
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/tree_policy.hpp> 
 
using namespace __gnu_pbds; 
 
using namespace std;
 
#define int long long
#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(),x.end()
#define ordered_mset tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update> 
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> 

const double INF = 1e4;

int binpow (int a, int n) {
	if (n == 0)
		return 1;
	if (n % 2 == 1)
		return binpow (a, n-1) * a;
	else {
		int b = binpow (a, n/2);
		return b * b;
	}
}

void solve(){	
	
	int n;
	cin >> n;
	double a[n],b[n];
	for(int i = 0;i < n;i++){
		cin >> a[i] >> b[i];
	}
	sort(a,a + n);
	sort(b,b + n);
	
	reverse(a,a + n);
	reverse(b,b + n);
	double prefa[n + 1];
	prefa[0] = 0;
	double prefb[n + 1];
	prefb[0] = 0;
	for(int i = 0;i < n;i++){
		prefa[i + 1] = prefa[i] + a[i];
		prefb[i + 1] = prefb[i] + b[i];
	}
	double ans = 0;
	for(int i = 1;i <= n;i++){
		int l = 1,r = n,res = n;
		while(l <= r){
			int mid = (r + l) >> 1;
			int cnt = i + mid;
			if(prefa[i] - (cnt) <= prefb[i] - cnt){
				res = mid;
				r = mid - 1;
			} else{
				l = mid + 1;
			}
		}
		int cnt = i + res;
		ans = max(ans,min(prefa[i] - cnt,prefb[res] - cnt));
		if(res != 1){
			res--;
		}	
		
		cnt = i + res;
		ans = max(ans,min(prefa[i] - cnt,prefb[res] - cnt));
		if(res != 1){
			res++;
		}
		if(res != n){
			res++;
		}
		
		cnt = i + res;
		ans = max(ans,min(prefa[i] - cnt,prefb[res] - cnt));
	}
	cout << fixed << setprecision(4);
	cout << ans << "\n";
	
}
 
signed main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0),cout.tie(0);
	
	int t = 1;
//	cin >> t;
	while(t--){
		solve();
	}
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 40
• Subtask 3: 0 / 40