Submission #872458

#	Time	Username	Problem	Language	Result	Execution time	Memory
872458		sleepntsheep	Balloons (CEOI11_bal)	C++17	50 / 100	2051 ms	8016 KiB

bal

#include <iostream>
#include <iomanip> 
#include <cmath>
#include <cstring>
#include <vector>
#include <algorithm>
#include <deque>
#include <set>
#include <utility>
#include <array>

using i64 = long long;
using u64 = unsigned long long;
using f64 = double;
using f80 = long double;

using namespace std;
#define ALL(x) x.begin(), x.end()
#define ShinLena cin.tie(nullptr)->sync_with_stdio(false);
#define N 200005

#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx2,tune=native")

int n, x[N];
f80 r[N];

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

    deque<int> q;
    q.push_back(0);

    for (int st = 0, i = 1; i < n; ++i)
    {
        for (auto it = q.rbegin(); it != q.rend(); ++it)
        {
            int j = *it;
            f80 A = (1L * x[i] * x[i] + 1L * x[j] * x[j] - 2L * x[i] * x[j]) / (4L * r[j]);
            r[i] = min(r[i], A);
        }

        while (q.size() && ::r[q.back()] <= ::r[i]) q.pop_back();
        q.push_back(i);
    }

    cout << fixed << setprecision(3);
    for (int i = 0; i < n; ++i)
        cout << r[i] << '\n';

    return 0;
}

Compilation message (stderr)

bal.cpp: In function 'int main()':
bal.cpp:37:14: warning: unused variable 'st' [-Wunused-variable]
   37 |     for (int st = 0, i = 1; i < n; ++i)
      |              ^~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10