제출 #356770

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
356770		penguinhacker	Mobile (BOI12_mobile)	C++14	100 / 100	505 ms	27628 KiB

mobile

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

#define ll long long
#define ar array

const int mxN = 1000000;
int n, l, x[mxN], y[mxN];

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout << fixed << setprecision(4);
	cin >> n >> l;
	for (int i = 0; i < n; ++i) cin >> x[i] >> y[i];
	double lb = 0, rb = 1.5e9;
	while(rb - lb > 1e-4) {
		double mid = (lb + rb) / 2;
		double cur = 0;
		for (int i = 0; i < n; ++i) {
			if (mid > abs(y[i])) {
				double r = sqrt(mid * mid - (ll)y[i] * y[i]);
				double a = x[i] - r, b = x[i] + r;
				if (a <= cur) cur = max(cur, b);
			}
		}
		if (cur > l) rb = mid;
		else lb = mid;
	}
	cout << lb;
	return 0;
}

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