Submission #605464

#	Time	Username	Problem	Language	Result	Execution time	Memory
605464		bzhu524	Mobile (BOI12_mobile)	C++14	4 / 100	281 ms	15960 KiB

mobile

#include <bits/stdc++.h>
#define ll long long 

using namespace std;

pair<ll, ll> p[1000000];


int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int n, len;

	cin >> n >> len;

	for (int i=0; i<n; i++) cin >> p[i].first >> p[i].second;

	double lower = 1;
	double upper = 1.5e9;

	while (upper - lower > 1e-3) {
		double mid = (upper + lower) / 2;
		double currPoint = 0;
		for (int i=0; i<n; i++) {
			ll x = p[i].first;
			ll y = p[i].second;
			
			double delta = sqrt(mid * mid - y * y);
			double p1 = x - delta;
			double p2 = x + delta;

			if (p1 <= currPoint) {
				currPoint = max(currPoint, p2);
			}
		}

		if (currPoint < len) {
			lower = mid;
		} else {
			upper = mid;
		}
	}

	cout << setprecision(4) << lower;
}

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