Submission #1059391

#	Time	Username	Problem	Language	Result	Execution time	Memory
1059391		ssitaram	Mobile (BOI12_mobile)	C++17	100 / 100	570 ms	51076 KiB

mobile

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

typedef long double ld;

int main() {
	ios::sync_with_stdio(0);
	cin.tie(nullptr);
	int n; cin >> n;
	ld ll; cin >> ll;
	ld lo = 0, hi = 1e12;
	vector<pair<ld, ld>> poi(n);
	for (int i = 0; i < n; ++i) cin >> poi[i].first >> poi[i].second;
	while (hi - lo > 1e-4) {
		ld mi = (lo + hi) / 2;
		ld till = 0;
		for (int i = 0; i < n; ++i) {
			if (mi * mi - poi[i].second * poi[i].second < 0) continue;
			ld sq = sqrt(mi * mi - poi[i].second * poi[i].second);
			ld h = sq + poi[i].first;
			ld l = - sq + poi[i].first;
			if (l <= till) {
				till = max(till, h);
			}
		}
		if (till >= ll) {
			hi = mi;
		} else {
			lo = mi;
		}
	}
	cout << fixed << setprecision(3) << lo << '\n';
	return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 4 / 4
• Subtask 4: 4 / 4
• Subtask 5: 4 / 4
• Subtask 6: 5 / 5
• Subtask 7: 5 / 5
• Subtask 8: 5 / 5
• Subtask 9: 5 / 5
• Subtask 10: 5 / 5
• Subtask 11: 5 / 5
• Subtask 12: 5 / 5
• Subtask 13: 5 / 5
• Subtask 14: 5 / 5
• Subtask 15: 5 / 5
• Subtask 16: 5 / 5
• Subtask 17: 5 / 5
• Subtask 18: 5 / 5
• Subtask 19: 5 / 5
• Subtask 20: 5 / 5
• Subtask 21: 5 / 5