Submission #507587

#	Time	Username	Problem	Language	Result	Execution time	Memory
507587		tabr	Hiring (IOI09_hiring)	C++17	100 / 100	641 ms	22128 KiB

hiring

#include <bits/stdc++.h>
using namespace std;
#ifdef tabr
#include "library/debug.cpp"
#else
#define debug(...)
#endif

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    long long w;
    cin >> n >> w;
    vector<pair<int, int>> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i].first >> a[i].second;
    }
    vector<int> order(n);
    iota(order.begin(), order.end(), 0);
    sort(order.begin(), order.end(), [&](int i, int j) {
        auto x = a[i];
        auto y = a[j];
        if (x.first * y.second != x.second * y.first) {
            return x.first * y.second < x.second * y.first;
        }
        return x.first < y.first;
    });
    multiset<pair<int, int>> st;
    long long sum = 0;
    pair<int, long double> ans = make_pair(0, 0);
    for (int i : order) {
        sum += a[i].second;
        st.emplace(a[i].second, i);
        while (sum * 1LL * a[i].first > w * a[i].second) {
            auto it = prev(st.end());
            sum -= it->first;
            st.erase(it);
        }
        ans = max(ans, make_pair((int) st.size(), -1.0L * sum * a[i].first / a[i].second));
    }
    if (ans.first == 0) {
        cout << 0 << '\n';
        return 0;
    }
    st.clear();
    sum = 0;
    for (int i : order) {
        sum += a[i].second;
        st.emplace(a[i].second, i);
        while (sum * 1LL * a[i].first > w * a[i].second) {
            auto it = prev(st.end());
            sum -= it->first;
            st.erase(it);
        }
        if (make_pair((int) st.size(), -1.0L * sum * a[i].first / a[i].second) == ans) {
            cout << ans.first << '\n';
            for (auto p : st) {
                cout << p.second + 1 << '\n';
            }
            break;
        }
    }
    return 0;
}

• Subtask 1: 30 / 30
• Subtask 2: 28 / 28
• Subtask 3: 6 / 6
• Subtask 4: 6 / 6
• Subtask 5: 6 / 6
• Subtask 6: 6 / 6
• Subtask 7: 6 / 6
• Subtask 8: 6 / 6
• Subtask 9: 6 / 6