Submission #1195896

#	Time	Username	Problem	Language	Result	Execution time	Memory
1195896		peteza	Balloons (CEOI11_bal)	C++17	20 / 100	158 ms	1996 KiB

bal

#include <bits/stdc++.h>
using namespace std;
using db = double;
using pdd = pair<db, db>;

deque<pdd> stk;
int n;
db x, r;

db quad(db a, db b, db c) {
    return (-b + sqrt(b*b-4*a*c)) / 2 / a;
}

db getx(pdd a, pdd b) {
    return quad(1/a.second/4 - 1/b.second/4, b.first/2/b.second - a.first/2/a.second, a.first*a.first/4/a.second - b.first*b.first/4/b.second);
}

db getrad(pdd xr, db xtwo) {
    return (xr.first - xtwo) * (xr.first - xtwo) / 4 / xr.second;
}

int main() {
    cin.tie(0) -> sync_with_stdio(0);
    cin >> n;
    cout << fixed << setprecision(3);
    while(n--) {
        cin >> x >> r;
        //cout << stk.size() << '\n';
        while(stk.size()>1 && getrad(stk[stk.size()-2], x) <= getrad(stk[stk.size()-1], x)) {
            stk.pop_back();
        }
        pdd topush = {x, (stk.empty() ? r : min(r, getrad(stk.back(), x)))};
        while(!stk.empty() && stk.back().second <= topush.second) stk.pop_back();
        while(stk.size() > 1 && getx(stk[stk.size()-2], topush) <= getx(stk[stk.size()-1], topush)) stk.pop_back();
        stk.emplace_back(topush);
        cout << topush.second << '\n';
    }
}

• 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