Submission #889550

#	Time	Username	Problem	Language	Result	Execution time	Memory
889550		ilef	Balloons (CEOI11_bal)	C++14	100 / 100	255 ms	7156 KiB

bal

#include <bits/stdc++.h>
using namespace std;
const int PRECISION = 3;
double calc_r(pair<double, double> a, double bx) {
	return (a.first - bx) * (a.first - bx) / (4 * a.second);
}
int main() {
	int n;
	cin >> n;
	vector<double> final_radius(n);
	stack<pair<double, double>> to_check;
	for (int i = 0; i < n; i++) {
		double x, r;
		cin >> x >> r;
		double max_r = r;
		while (!to_check.empty()) {
			pair<double, double> last = to_check.top();
			double to_last_r = calc_r(last, x);
			max_r = min(max_r, to_last_r);
			if (max_r >= last.second) {
				to_check.pop();
				continue;
			}
			else {
				break;
			}
		}
		to_check.push({x, max_r});
		final_radius[i] = max_r;
	}
	cout << fixed << setprecision(PRECISION);
	for (double &r : final_radius) { cout << r << "\n"; }
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10