Submission #1198552

#	Time	Username	Problem	Language	Result	Execution time	Memory
1198552		Born_To_Laugh	Balloons (CEOI11_bal)	C++17	10 / 100	97 ms	7492 KiB

bal

// Born_To_Laugh - Hughie Do
#include <bits/stdc++.h>
#define alle(sth) sth.begin(), sth.end()
using namespace std;
typedef long long ll;
typedef long double ld;
[[maybe_unused]] const ll MOD = 998244353, INF = 1e9 + 7;

const int maxn = 2e5 + 10;
int n;
vector<int> x(maxn, 0), r(maxn, 0);
vector<ld> val(maxn, 0.0);

ld func(int i, int j){
    ld num = (ld)(x[i] - x[j]) * (x[i] - x[j]);
    ld num1 = (ld)4 * val[j];
    return num / num1;
}
void solve(){
    cin >> n;
    for(int i=1; i<=n; ++i){
        cin >> x[i] >> r[i];
    }

    vector<int> st;
    for(int i=1; i<=n; ++i){
        while(!st.empty() && func(i, st.back()) > val[st.back()]){
            // cout << func(i, st.back()) << ' ' << val[st.back()];
            st.pop_back();
        }
        if(st.empty()) val[i] = (ld)r[i];
        else {
            val[i] = func(i, st.back());
            // cout << i << ' ' << st.back() << '\n';
        }
        val[i] = min(val[i], (ld)r[i]);
        st.push_back(i);
        cout << val[i] << '\n';
    }
    // cout << func(3, 1);
}
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout << fixed << setprecision(7);
    solve();
}
// Lotus

• Subtask 1: 10 / 10
• Subtask 2: 0 / 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