Submission #906202

#	Time	Username	Problem	Language	Result	Execution time	Memory
906202		Ludissey	Mobile (BOI12_mobile)	C++14	100 / 100	824 ms	15964 KiB

mobile

#include <bits/stdc++.h>
using namespace std;
#define int double
 
double dist(double x1, double y1, double x2, double y2){
    double dist=sqrt(pow((x1-x2),2)+pow((y1-y2),2));
    return dist;
}

signed main() {
    ios::sync_with_stdio(false); cin.tie(nullptr);
    int N,L; cin >> N >> L;
    vector<pair<double,double>> a(N);
    for (int i = 0; i < N; i++){
        cin >> a[i].first >> a[i].second;
        a[i].second=abs(a[i].second);
    }
    int l=0,r=L;
    int ans;
    while(r-l>0.0003){
        int mid=(l+r)/2;
        int rght=0;
        for (int i = 0; i < N; i++)
        {
            int pnt1=a[i].first-sqrt(pow(mid,2)-pow(a[i].second,2)),pnt2=a[i].first+sqrt(pow(mid,2)-pow(a[i].second,2));
            if(mid>=a[i].second){
                if(pnt1<=rght) rght=max(rght, pnt2);
            }
        }
        if(rght>=L) {
            r=mid;
            ans=r;
        }else{
            l=mid;
        }
    }
    cout << setprecision(5) << fixed << (double)ans << "\n";
    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 4 / 4
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• Subtask 21: 5 / 5