Submission #890431

#	Time	Username	Problem	Language	Result	Execution time	Memory
890431		arbuzick	Let's Win the Election (JOI22_ho_t3)	C++17	10 / 100	1 ms	600 KiB

Main

#include <bits/stdc++.h>

using namespace std;

void solve() {
    int n, k;
    cin >> n >> k;
    vector<int> a(n), b(n);
    vector<pair<int, int>> s_a, s_b;
    for (int i = 0; i < n; ++i) {
        cin >> a[i] >> b[i];
        s_a.emplace_back(a[i], i);
        if (b[i] != -1) {
            s_b.emplace_back(b[i], i);
        }
    }
    sort(s_a.begin(), s_a.end());
    sort(s_b.begin(), s_b.end());
    long double ans = 1e9 + 7;
    for (int cnt_b = 0; cnt_b <= k && cnt_b <= (int)s_b.size(); ++cnt_b) {
        long double ans_nw = 0;
        vector<int> used(n);
        int speed = 1, cnt = 0;
        for (int i = 0; i < cnt_b; ++i) {
            ans_nw += s_b[i].first / (long double)speed;
            cnt++;
            speed++;
            used[s_b[i].second] = 1;
        }
        for (int i = 0; i < n; ++i) {
            if (cnt < k && !used[s_a[i].second]) {
                ans_nw += s_a[i].first / (long double)speed;
                cnt++;
                used[s_a[i].second] = 1;
            }
        }
        ans = min(ans, ans_nw);
    }
    cout << ans << '\n';
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.precision(3);
    cout << fixed;
    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
    }
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 0 / 11
• Subtask 4: 0 / 12
• Subtask 5: 0 / 33
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23