Submission #928405

#	Time	Username	Problem	Language	Result	Execution time	Memory
928405		Aiperiii	Sure Bet (CEOI17_sure)	C++14	100 / 100	123 ms	5228 KiB

sure

#include <bits/stdc++.h>
#define int long long
#define ff first
#define ss second
#define all(x) x.begin(),x.end()
#define pb push_back
using namespace std;
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];
        a[i]--;b[i]--;
    }
    sort(all(a));sort(all(b));
    reverse(all(a));reverse(all(b));
    long double p1=0,p2=0;
    long double sum1=0,sum2=0;
    long double ans=0;
    while(p1<n){
        sum1+=a[p1];
        p1++;
        while(min(sum1-p2,sum2-p1)<=min(sum1-p2-1,sum2+b[p2]-p1) && p2<n){
            sum2+=b[p2];
            p2++;
        }
        ans=max(ans,min(sum1-p2,sum2-p1));
    }
    cout<<fixed<<setprecision(4)<<ans<<"\n";
}
/*
4
1.4 3.7
1.2 2
1.6 1.4
1.9 1.5
 */

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