Submission #1063643

#	Time	Username	Problem	Language	Result	Execution time	Memory
1063643		daviedu	Balloons (CEOI11_bal)	C++17	100 / 100	111 ms	14928 KiB

bal

#include <bits/stdc++.h>
using namespace std;

#define fastio ios_base::sync_with_stdio(0); cin.tie(0)
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define ll long long
#define ld long double

struct P{
    ll x, y;
};

void dbg_out() { cerr << endl; }
template <typename H, typename... T>
void dbg_out(H h, T... t) { cerr << ' ' << h; dbg_out(t...); }
#define dbg(...) { cerr << #__VA_ARGS__ << ':'; dbg_out(__VA_ARGS__); }

ld max_r(ll a, ll b, ld R){
    return (a-b)*(a-b) / (4*R);
}

signed main(){
    fastio;
    int n;
    cin >> n;
    vector<pair<int, ld>> arr (n);
    for (int i=0; i<n; i++){
        cin >> arr[i].first >> arr[i].second;
    }
    vector<ld> ans (n);
    stack<int> can_touch;
    for (int i=0; i<n; i++){
        auto [x, r] = arr[i];
        ld best=r;
        while (!can_touch.empty()){
            int X = arr[can_touch.top()].first;
            ld R = ans[can_touch.top()];
            
            // touches
            if (best >= max_r(x, X, R)) best = max_r(x, X, R);
            if (best >= R) can_touch.pop();
            else break;
        }
        ans[i] = best;
        can_touch.push(i);
    }
    cout << fixed << setprecision(3);
    for (int i=0; i<n; i++) cout << ans[i] << ' ';
    cout << '\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