Submission #906111

#	Time	Username	Problem	Language	Result	Execution time	Memory
906111		Nonoze	Mobile (BOI12_mobile)	C++17	0 / 100	496 ms	16220 KiB

mobile

#include <bits/stdc++.h>

#define int long long
#define sz(x) (int)(x.size())

using namespace std;

int n, L;
vector<pair<double, double>> a;

long double dist(long double x1, pair<long double, long double> other) {
	long double y1=0;
	long double x2=other.first, y2=other.second;
	return ((long double)sqrt((long double)((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1))));
}

void solve() {
	cin >> n >> L;
	a.clear();
	a.resize(n);
	for (auto &u: a) cin >> u.first >> u.second;
	double ans=0;
	double l=0, r=1e9;
	while (r-l>=0.00001) {
		double mid=(l+r)/2;
		double borne=0;
		for (int i=0; i<n; i++) {
			double x=a[i].first, y=a[i].second;
			double dist=sqrt((double)(mid*mid-y*y));
			if (x-dist<=borne) borne+=x+dist;
		}
		if (borne>=L) {
			ans=mid;
			r=mid-0.00001;
		}
		else l=mid+0.00001;
	}
	cout << fixed << setprecision(4) << ans << endl;
	return;
}


signed main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	solve();
	return 0;
}

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