Submission #1194356

#	Time	Username	Problem	Language	Result	Execution time	Memory
1194356		almaharbas4	Mobile (BOI12_mobile)	C++20	100 / 100	282 ms	16944 KiB

mobile

#include<bits/stdc++.h>
#define x first
#define y second
#define ll long long
using namespace std;
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(nullptr);
    ll n,len;
    cin>>n>>len;
    vector<pair<ll,ll>> v;
    for(int i=0;i<n;i++)
    {
        ll a,b;
        cin>>a>>b;
        v.push_back({a,b});
    }
    double l=1;
    double r=1.5e9;
    while(r-l>1e-3)
    {
        double mid=(l+r)/2;
        double cur=0;
        for(int i=0;i<n;i++)
        {
            double delta=sqrt(mid*mid-v[i].y*v[i].y);
            double a=v[i].x-delta;
            double b=v[i].x+delta;
            if(a<=cur) cur=max(b,cur);
        }
        if(cur>=len) r=mid;
        else l=mid;
    }
    cout<<fixed<<setprecision(4)<<l<<endl;
    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 4 / 4
• Subtask 4: 4 / 4
• Subtask 5: 4 / 4
• Subtask 6: 5 / 5
• Subtask 7: 5 / 5
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• Subtask 10: 5 / 5
• Subtask 11: 5 / 5
• Subtask 12: 5 / 5
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• Subtask 15: 5 / 5
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• Subtask 19: 5 / 5
• Subtask 20: 5 / 5
• Subtask 21: 5 / 5