Submission #1104152

#	Time	Username	Problem	Language	Result	Execution time	Memory
1104152		YudoTLE	Balloons (CEOI11_bal)	C++17	20 / 100	120 ms	7628 KiB

bal

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

using ll = long long;
using db = double;
using ldb = long double;
using vi = vector<int>;
using vll = vector<ll>;
using vdb = vector<db>;
using vldb = vector<ldb>;
using vb = vector<bool>;
using pi = pair<int, int>;
using pll = pair<ll, ll>;

#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()


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

	auto cmp = [&](int src, int i1, int i2)
	{
		ll dx1 = abs(x[src] - x[i1]);
		ll dx2 = abs(x[src] - x[i2]);

		ldb c1 = dx1 * dx1 / r[i1];
		ldb c2 = dx2 * dx2 / r[i2];

		return c1 <= c2;
	};

	vi stk{0};
	for (int i = 1; i < n; i++)
	{
		while (stk.size() > 1 && cmp(i, stk[stk.size() - 2], stk.back()))
			stk.pop_back();
		
		ll dx = abs(x[stk.back()] - x[i]);
		r[i] = min(r[i], dx * dx / (r[stk.back()] * 4));
		stk.pb(i);
	}

	cout << fixed << setprecision(4);
	for (int i = 0; i < n; i++)
		cout << r[i] << " \n"[i==n-1];
}

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

	int t = 1;
	// cin >> t;
	while (t--) 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