Submission #1032986

#	Time	Username	Problem	Language	Result	Execution time	Memory
1032986		amine_aroua	Sure Bet (CEOI17_sure)	C++17	100 / 100	160 ms	3672 KiB

sure

#include<bits/stdc++.h> 
using namespace std;
void read(vector<double> &a , vector<double> &b , int &n)
{
    cin>>n;
    a.assign(n , 0);
    b = a;
    for(int i = 0 ;i < n ; i++)
    {
        cin>>a[i]>>b[i];
    }
}
void brute(vector<double> &a , vector<double> &b , int &n)
{
    n = rand()%10 + 1;
    a.assign(n , 0);
    b = a;
    for(int i = 0 ;i < n ; i++)
    {
        a[i] = rand()%5 + 4;
        b[i] = rand()%5 + 4;
    }
}
int main()
{
    int n ;
    vector<double> a , b;
    read(a , b , n);
    sort(a.rbegin() , a.rend());
    sort(b.rbegin() , b.rend());
    double ans1 = 0;
    for(int i = 0 ; i < n ; i++)
    {
        a[i]--;
        b[i]--;
    }
    for(int i = 1 ; i < n ; i++)
    {
        a[i]+=a[i - 1];
        b[i]+=b[i - 1];
    }
    for(int na = 1; na <= n ; na++)
    {
        double lo = 0 , hi = a[na - 1] - 1;
        for(int i = 0 ; i < 40 ; i++)
        {
            double md = (lo + hi)/2;
            if(b[max(0 , min((int)floor(a[na - 1] - md - 1) , n - 1))] >= na + md)
            {
                lo = md;
            }
            else
                hi = md;
        }
        ans1 = max(ans1 , lo);
    }
    printf("%.4lf",(double)ans1);

    
}

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