Submission #938300

#	Time	Username	Problem	Language	Result	Execution time	Memory
938300		vjudge1	Sure Bet (CEOI17_sure)	C++17	100 / 100	120 ms	3672 KiB

sure

#include <bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define all(a) a.begin(), a.end()
#define int long long
const int N = 2e5;
const int mod = 1e9 + 7;


signed main(){
   
   int n; cin >> n;
   vector<long double> a(n), b(n);
	for(int i = 0;i < n; i++){
		cin >> a[i] >> b[i];
	}
   long double ans = 0.0;
   sort(a.rbegin(), a.rend());
   sort(b.rbegin(), b.rend());
   
   long double s = 0, s1 = 0;
   int cnt = 0, i =0 ;
   for(int j = 0;j < n; j++){
	   s1+= b[j];
	   cnt++;
	   ans = max(ans, min(s, s1) - cnt);
	   while(i < n && s - cnt <= s1-cnt){
		   s+= a[i];
		   i++, cnt++;
		   ans = max(ans, min(s, s1) - cnt);
	   }
   }
  
   printf("%.4lf", (double)ans);
  return 0;
}

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