Submission #1024268

#	Time	Username	Problem	Language	Result	Execution time	Memory
1024268		angels	Mobile (BOI12_mobile)	C++14	90 / 100	1065 ms	31580 KiB

mobile

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

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    long long int n, L;
    cin>>n>>L;
    vector<pair<long double, long double>>v(n);
    for(int i=0; i<n; i++)
    {
        cin>>v[i].first>>v[i].second;
    }
    long double l=1, r=1.5e9;
    while(r-l>1e-3)
    {
        long double mid=(l+r)/2.0;
        long double granica=0;
        for(int i=0; i<n; i++)
        {
            long double opseg=sqrt(mid*mid-v[i].second*v[i].second);
            long double minn=v[i].first-opseg;
            long double maxx=v[i].first+opseg;
            if(minn<=granica)
            {
                granica=max(granica, maxx);
            }
        }
        if(granica<L)
        {
            l=mid;
        }
        else
            r=mid;
    }
    cout<<fixed<<setprecision(4)<<l;

    return 0;
}

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