Submission #670284

#	Time	Username	Problem	Language	Result	Execution time	Memory
670284		RadicaI	Mobile (BOI12_mobile)	C++17	8 / 100	768 ms	15948 KiB

mobile

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main(){
	cout.precision(7);
	int n,siz; cin >> n>>siz;
	pair<ll, ll> stations[n];
	for(int i=0; i<n; i++) cin >> stations[i].first >> stations[i].second;
	double l = 1; double r = 1.5e9;
	while(r - l > 1e-3){
		double m = (l+r)/2.0;
		double store=0;
		for(int i=0; i<n; i++){
			if(abs(stations[i].second) <=m){
				double ph = stations[i].first + sqrt(m*m-stations[i].second*stations[i].second);
				double pl = stations[i].first - sqrt(m*m-stations[i].second*stations[i].second);
				if(pl<=store) store = max(store, ph);
			}
		}
		if(store>=siz) r=m;
		else l=m;
		
	}
	cout << l;
}

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