Submission #401552

#	Time	Username	Problem	Language	Result	Execution time	Memory
401552		benk	Balloons (CEOI11_bal)	C++14	20 / 100	196 ms	8400 KiB

bal

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

#define all(x)      x.begin(), x.end()
#define pb          push_back
#define sz(x)       (int)(x.size())
#define ll          long long
#define fi          first
#define se          second
#define lbd         lower_bound
#define ubd         upper_bound

const int MOD = 1e9 + 7;
const double eps = 1e-10;
const long long INF = 1e18;
const int N = 2e5 + 10;


void solve() {
	int n;
	cin >> n;
	vector<int> x(n), r(n);
	for (int i = 0; i < n; i++) cin >> x[i] >> r[i];

	vector<pair<int, double>> s;
	for (int i = 0; i < n; i++) {
		ll tmp;
		while (sz(s) >= 2) {
			tmp = 1LL * (x[i] - s.back().fi) * (x[i] - s.back().fi);
			double r1 = (tmp * 4 * s[sz(s) - 2].se);
			tmp = 1LL * (x[i] - s[sz(s) - 2].fi) * (x[i] - s[sz(s) - 2].fi);
			double r2 = (tmp * 4 * s.back().se);

			if (r1 >= r2) s.pop_back();
			else break;
		}
		if (!s.empty())
			tmp = 1LL * (x[i] - s.back().fi) * (x[i] - s.back().fi);

		double ans;
		if (s.empty()) ans = r[i];
		else ans = min(1.0 * r[i], tmp / (4 * s.back().se));
		cout << fixed << setprecision(10) << ans << '\n';
		s.pb({x[i], ans});
	}
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	int tt = 1;
	//cin >> tt;
	while (tt--) {
		solve();
	}
	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10