Submission #1004526

#	Time	Username	Problem	Language	Result	Execution time	Memory
1004526		Thunnus	Balloons (CEOI11_bal)	C++17	100 / 100	148 ms	8764 KiB

bal

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
using i64 = long long;
template<class T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define int i64
#define vi vector<int>
#define vvi vector<vi>
#define vb vector<bool>
#define pii pair<int, int>
#define fi first
#define se second
#define double long double
#define sz(x) (int)(x).size()

inline double calc_radius(pair<double, double> a, double bx){ // a.fi -> a.x, a.se -> a.r
    return (a.fi - bx) * (a.fi - bx) / (4 * a.se); // comes from Pythagorean theorem
}

signed main(){
    ios_base::sync_with_stdio(false); cin.tie(0);
    int n;
    double x, r;
    cin >> n;
    stack<pair<double, double>> s;
    vector<double> ans(n);
    for(int i = 0; i < n; i++){
        cin >> x >> r;
        double maxr = r;
        while(!s.empty()){
            pair<double, double> prev = s.top();
            double curr = calc_radius(prev, x);
            maxr = min(maxr, curr);
            if(maxr >= prev.se)
                s.pop();
            else
                break;
        }
        s.push({x, maxr});
        ans[i] = maxr;
    }
    cout << fixed << setprecision(3);
    for(double d : ans)
        cout << d << "\n";
    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