Submission #898473

#	Time	Username	Problem	Language	Result	Execution time	Memory
898473		ivaziva	Mobile (BOI12_mobile)	C++17	100 / 100	731 ms	36020 KiB

mobile

#include <bits/stdc++.h>

using namespace std;

long long n,x;
vector<pair<long long,long long>> vec;

int main()
{
    cin>>n>>x;
    for (long long i=1;i<=n;i++)
    {
        long long xx,yy;
        cin>>xx>>yy;
        vec.push_back({xx,yy});
    }
    double l=0.00;
    double r=1500000000.00;
    while (r-l>=0.0001)
    {
        double mid=(l+r)/2;
        double tren=0.00;
        for (long long i=0;i<n;i++)
        {
            double val=sqrt(mid*mid-vec[i].second*vec[i].second*1.00);
            double levo=vec[i].first*1.00-val;
            double desno=vec[i].first*1.00+val;
            if (levo<=tren) {tren=max(tren,desno);}
        }
        if (tren>=x*1.00) r=mid;
        else l=mid;
    }
    cout<<fixed<<showpoint<<setprecision(4)<<l<<endl;
}

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• Subtask 21: 5 / 5