Submission #938331

#	Time	Username	Problem	Language	Result	Execution time	Memory
938331		vjudge1	Sure Bet (CEOI17_sure)	C++17	100 / 100	105 ms	2136 KiB

sure

#include <bits/stdc++.h>
#define int long long
#define ff first
#define ss second
#define pb push_back
#define all(x) x.begin(),x.end()
using namespace std;
signed main(){
    ios_base::sync_with_stdio();
    cin.tie(0);cout.tie(0);
    int n;
    cin>>n;
    vector <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));
    double ans=0;
    double sum1=0,sum2=0;
    int cnt=0;
    for(int i=0;i<n;i++){
        sum1+=a[i];
        while(cnt<n && min(sum1-cnt,sum2-i-1)<=min(sum1-cnt-1,sum2+b[cnt]-i-1)){
            sum2+=b[cnt];
            cnt++;
        }
        ans=max(ans,min(sum1-cnt,sum2-i-1));
    }
    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