Submission #1174242

#	Time	Username	Problem	Language	Result	Execution time	Memory
1174242		soab	Balloons (CEOI11_bal)	C++20	100 / 100	108 ms	6836 KiB

bal

//  soab

#include<bits/stdc++.h>

using namespace std;

#define int long long
#define nl '\n'
#define fi first
#define se second

void io() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);
    // freopen(".INP", "r", stdin);
    // freopen(".OUT", "w", stdout);
}

double calc(pair<double,double> a, pair<double,double> b) {
    return (a.fi - b.fi) * (a.fi - b.fi) / (4 * b.se);
}

signed main() {
    io();

    int n; cin >> n;
    vector<pair<double,double>> a(n);
    for(int i = 0; i < n; i++) {
        double x, r; cin >> x >> r;
        a[i] = {x, r};
    }

    stack<pair<double,double>> st;
    vector<double> ans;

    for(int i = 0; i < n; i++) {
        auto [bx, br] = a[i];
        while(!st.empty()) {
            auto [ax, ar] = st.top();
            br = min(br, calc(a[i], st.top()));
            
            if(br >= ar) {
                st.pop();
            } else {
                break;
            }
        }

        st.push({bx, br});
        ans.push_back(br);
    }

    for(auto i : ans) {
        cout << fixed << setprecision(3) << i << nl;
    }
    
    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