Submission #1015800

#	Time	Username	Problem	Language	Result	Execution time	Memory
1015800		vjudge1	Sure Bet (CEOI17_sure)	C++17	100 / 100	81 ms	3736 KiB

sure

#include <bits/stdc++.h>
using namespace std;

#define int long long

signed main(){
    int n; cin>>n;
    vector<double> a(n),b(n);
    for (int i=0; i<n; i++) cin>>a[i]>>b[i];
    sort(a.begin(),a.end(),greater<double>());
    sort(b.begin(),b.end(),greater<double>());
    //now take prefix sums
    for (int i=1; i<n; i++){

        a[i]=a[i-1]+a[i];
    }
    for (int i=1; i<n; i++){
        b[i]=b[i-1]+b[i];
    }
    double ans=0;
    int r=0;
    for (int i=0; i<n; i++){

        while (r<n and b[r]<a[i]) r++;
        if (r>=n) break;
        ans=max(ans, a[i]-(i+1+r+1));
    }
    r=0;
    for (int i=0; i<n; i++){

        while (r<n and a[r]<b[i]) r++;
        if (r>=n) break;
        ans=max(ans, b[i]-(i+1+r+1));
    }
    printf("%.4lf",(double)ans);

}

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