Submission #638910

#	Time	Username	Problem	Language	Result	Execution time	Memory
638910		endy	Mobile (BOI12_mobile)	C++17	0 / 100	597 ms	39592 KiB

mobile

#include <bits/stdc++.h>

using namespace std;

int n, l, d;
vector < pair<double,double> > coord;
vector < pair<double, pair<double, int> > > dist;

int main(){

	ios::sync_with_stdio(false); cin.tie(0);

	cin >> n >> l;

	for(int i=0 ; i<n ; i++){
		double a, b;
		cin >> a >> b;

		coord.push_back(make_pair(a,b));

		double dmin, dmax;

		if(a < 0){
			dmin = (a*a)+(b*b);
			dmax = ((a+l)*(a+l))+(b*b);
		}else if(a >= 0 and a <=l){

			dmin = b;

			if(a <= l/2) dmax = ((l-a)*(l-a))+(b*b);
			else dmax = (a*a)+(b*b);

		}else if(a > l){
			dmin = ((a-l)*(a-l))+(b*b);
			dmax = (a*a)+(b*b);
		}

		dist.push_back(make_pair(dmin, make_pair(dmax, i)));
	}

	sort(dist.begin(), dist.end());

	double t = dist[n-2].second.second, u = dist[n-1].second.second;

	double ax = coord[t].first, ay = coord[t].second, bx = coord[u].first, by = coord[u].second;

	double T = (ax*ax), U = (ay*ay), V = (bx*bx), W = (by*by);

	double centro = (U+V-W-T)/(2*(bx-ax));

	if(centro > bx){

		d = (by*by)+((centro-bx)*(centro-bx));
	}else{
		d = (by*by)+((bx-centro)*(bx-centro));
	}

	cout << sqrt(d) << endl;


}

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