Submission #906201

#	Time	Username	Problem	Language	Result	Execution time	Memory
906201		Mikhail	Mobile (BOI12_mobile)	C++14	8 / 100	924 ms	16312 KiB

mobile

#include <iostream>
#include <math.h>
#define MAX_N 1000000
double x[MAX_N], y[MAX_N];
#define MAX(a,b)  ((a > b) ? a : b)

using namespace std;

int main() {
	int N;
	cin >> N;
	double L;
	cin >> L;

	for (int i = 0; i < N; i++) {
		cin >> x[i] >> y[i];
		y[i] = y[i] * y[i];
	}


	double l = 0., m, r = 2e9, m_sqr, c, t0, tn;
	while(r - l > 0.00001) {
		m = l / 2 + r / 2;
		m_sqr = m * m;
		c = 0.;
		for (int j = 0; j < N; j++) {
			if (m_sqr < y[j]) continue;
			t0 = sqrt(m_sqr - y[j]);
			tn = x[j] - t0;
			if (tn > c) continue;
			t0 += x[j];
			c = MAX(t0, c);
		}
		//cout << c << ' ' << l << ' ' << r << ' ' << min_t <<  '\n';
		if (c > L) r = m;
		else l = m;
	}
	cout << l / 2 + r / 2 << '\n';
	return 0;
}

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