Submission #920753

#	Time	Username	Problem	Language	Result	Execution time	Memory
920753		ethanv13	Mobile (BOI12_mobile)	C++17	12 / 100	692 ms	8276 KiB

mobile

#include <bits/stdc++.h>
using namespace std;
int main() {
    int n,l;cin>>n>>l;
    vector<pair<int,int>>a(n);
    for(int i=0;i<n;++i){
        cin>>a[i].first>>a[i].second;
    }
    long double lo=0;
    long double hi=4e9;
    long double delta=1e-5;
    while(hi-lo>delta){
        long double mid=(lo+hi)/2;
        long double curr=0;
        for(int i=0;i<n;++i){
            long double dist=sqrt(mid*mid-a[i].second*a[i].second);
            if(a[i].first-dist<=curr){curr=max(a[i].first+dist,curr);}
        }
        if(curr>=l){hi=mid;}else{lo=mid;}
    }
    cout<<fixed<<setprecision(5);
    cout<<lo<<endl;
}

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