Submission #1124352

#	Time	Username	Problem	Language	Result	Execution time	Memory
1124352		heey	Balloons (CEOI11_bal)	C++20	100 / 100	122 ms	4932 KiB

bal

#include<bits/stdc++.h>
#define f first
#define s second
#define all(x) (x).begin(), (x).end()
#define mod 1'000'000'007
#define inf 1'000'000'000'000'00
#define pb push_back
#define vvi vector<vi>
#define fst ios_base::sync_with_stdio(0);cin.tie(0);
using namespace std;

int x[200005], r[200005];

signed main(){
	fst
	int n; cin >> n;
	for(int i = 0; i < n; i++){
		cin >> x[i] >> r[i];
	}


	vector<double> ans(n);
	stack<int> bl;
	for(int i = 0; i < n; i++){
		ans[i] = r[i];
		while(!bl.empty()){
			int j = bl.top();
			int d = x[i] - x[j];
			double res = (double)d*d / (4*ans[j]);
			ans[i] = min(ans[i], res);
			if(ans[i] >= ans[j]) bl.pop();
			else break;
		}
		bl.push(i);
	}


	cout << fixed << setprecision(3);
	for(int i = 0; i < n; i++) cout << ans[i] << '\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