Submission #205181

#	Time	Username	Problem	Language	Result	Execution time	Memory
205181		ruler	Balloons (CEOI11_bal)	C++14	100 / 100	218 ms	9988 KiB

bal

// IOI 2021
#include <bits/stdc++.h>
using namespace std;

#define endl '\n'
#define ends ' '
#define die(x) return cout << x << endl, 0
#define all(v) v.begin(), v.end()
#define sz(x) (int)(x.size())
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) { cerr << ends << H; debug_out(T...); }
#define debug(...) cerr << "{" << #__VA_ARGS__ << "}:", debug_out(__VA_ARGS__)
typedef long long ll;
typedef pair<int, int> pii;
const ll INF = 1e9;
const ll MOD = 1e9 + 7;

////////////////////////////////////////////////////////////////////

const int N = 2e5 + 3;

typedef long double ld;
int X[N];
ld R[N];
stack<int> S;

ld GetRad(int dis, ld r) { return 1LL * dis * dis / r / 4; }

int main() {

	ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);	
	
	int n; cin >> n;
	for (int i = 0; i < n; i++) cin >> X[i] >> R[i];
	for (int i = 0; i < n; i++) {
		while (!S.empty()) {
			int l = S.top();
			ld r = GetRad(X[i] - X[l], R[l]);
			if (r < R[i]) R[i] = r;
			if (R[i] > R[l]) S.pop(); else break;
		}
		S.push(i);
		cout << fixed << setprecision(3) << R[i] << endl;
	}

	return 0;
}

• 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