Submission #923720

#	Time	Username	Problem	Language	Result	Execution time	Memory
923720		vanea	Balloons (CEOI11_bal)	C++14	100 / 100	159 ms	7524 KiB

bal

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

double calc_r(array<double, 2> a, double bx) {
    return (a[0] - bx) * (a[0] - bx) / (4 * a[1]);
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin >> n;
    vector<double> ans(n);
    stack<array<double, 2>> s;
    for(int i = 0; i < n; i++) {
        double x, r;
        cin >> x >> r;
        double mx_r = r;
        while(!s.empty()) {
            array<double, 2> last = s.top();
            double ro_last_r = calc_r(last, x);
            mx_r = min(mx_r, ro_last_r);
            if(mx_r >= last[1]) {
                s.pop();
                continue;
            }
            else break;
        }
        s.push({x, mx_r});
        ans[i] = mx_r;
    }
    cout << fixed << setprecision(5);
    for(auto it : ans) cout << it << ' ';
}

• 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