Submission #941155

#	Time	Username	Problem	Language	Result	Execution time	Memory
941155		agawron	Balloons (CEOI11_bal)	C++14	100 / 100	114 ms	8576 KiB

bal

#include<bits/stdc++.h>

using namespace std;
using pdd = pair <double, double>;

#define f first
#define s second

constexpr int MAX_N = 2e5 + 5;

double calc_r(pdd last, double cord){
    return (last.f - cord) * (last.f - cord)/(4 * last.s);
}

int n;
int x[MAX_N], r[MAX_N];
double ans[MAX_N];

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n;

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

    stack <pdd> st;

    for(int i = 0; i < n; i++){

        double max_r = r[i];

        while(st.size() > 0){
            pdd last = st.top();

            double to_last = calc_r(last, x[i]);

            max_r = min(max_r, to_last);

            if(last.s > max_r) break;
            else{
                st.pop();
                continue;
            }
        }

        st.push({x[i], max_r});

        ans[i] = max_r;
    }

    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