Submission #916408

#	Time	Username	Problem	Language	Result	Execution time	Memory
916408		codefox	Mobile (BOI12_mobile)	C++14	4 / 100	277 ms	15964 KiB

mobile

#include<bits/stdc++.h>
 
using namespace std;
 
#define ll long long
#define pii pair<ll, ll>
#define pdd pair<double, double>
 
double prec = 1e6;
 
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
 
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    
    cout << setprecision(5);
    int n, l;
    cin >> n >> l;
    vector<pii> stations(n);
    for (int i = 0; i < n; i++)
    {
        int a, b;
        cin >> a >> b;
        stations[i] = {a, b};
    }
    double dist = 0;
    ll one = 1;
    for (int i = 50; i >= 0; i--)
    {
        dist += (one<<i)/prec;
        double highest = 0;
 
        for (pii ele:stations)
        {
            double dy = ele.second*ele.second;
            double diff = dist*dist-dy;
            if (diff <= 0) continue;
            double dx = sqrt(diff);
            double f = ele.first-dx;
            double s = ele.first+dx;
            if (f < highest) highest = max(highest, s);
        }
        if (highest < l) continue;
        dist -= (one<<i)/prec; 
    }
    cout << dist << "\n";
    return 0;
}

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