Submission #1131691

#	Time	Username	Problem	Language	Result	Execution time	Memory
1131691		monostack	Mobile (BOI12_mobile)	C++20	0 / 100	1097 ms	31556 KiB

mobile

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

#define ld long double

ld n,l; 

ld P(pair<ld,ld> x, pair<ld,ld> y){
    return min(l,max((ld)0,(x.first*x.first + x.second*x.second - y.first*y.first - y.second*y.second)/(2*(x.first - y.first))));
}

int main(){
    cin>>n>>l;
    vector<pair<ld,ld>> a(n);
    ld ans = 1e12;
    for(auto i = 0; i < n; i++){
        cin>>a[i].first>>a[i].second;
        for(auto j = 0; j < i; j++){
            ans = min(ans, P(a[j],a[i]));
        }
    }
    cout<<fixed<<setprecision(8);
    cout<<ans<<'\n';
}

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