Submission #1282087

#	Time	Username	Problem	Language	Result	Execution time	Memory
1282087		lukasuliashvili	Festival (IOI25_festival)	C++20	Compilation error	0 ms	0 KiB

festival

#include <vector>
#include <algorithm>

std::vector<int> max_coupons(int A, std::vector<int> P, std::vector<int> T) {
    int N = P.size();


    bool is_sub1 = std::all_of(T.begin(), T.end(), [](int t) { return t == 1; });
    if (is_sub1) {
        std::vector<std::pair<int, int>> items;
        for (int i = 0; i < N; ++i) items.emplace_back(P[i], i);
        std::sort(items.begin(), items.end());
        std::vector<int> res;
        for (auto& [price, idx] : items) {
            if (A >= price) {
                A -= price;
                res.push_back(idx);
            } else break;
        }
        return res;
    }


    if (N <= 20) {
        std::vector<int> indices(N);
        for (int i = 0; i < N; ++i) indices[i] = i;
        std::vector<int> best;
        do {
            int tokens = A;
            std::vector<int> used;
            for (int i = 0; i < N; ++i) {
                int idx = indices[i];
                if (tokens >= P[idx]) {
                    tokens = (tokens - P[idx]) * T[idx];
                    used.push_back(idx);
                } else break;
            }
            if (used.size() > best.size()) best = used;
        } while (std::next_permutation(indices.begin(), indices.end()));
        return best;
    }

    std::vector<int> result, current_path;
    std::vector<bool> used(N, false);

    std::function<void(int)> dfs = [&](int tokens) {
        if (current_path.size() > result.size()) result = current_path;
        for (int i = 0; i < N; ++i) {
            if (!used[i] && tokens >= P[i]) {
                used[i] = true;
                current_path.push_back(i);
                dfs((tokens - P[i]) * T[i]);
                current_path.pop_back();
                used[i] = false;
            }
        }
    };

    dfs(A);
    return result;
}

Compilation message (stderr)

festival.cpp: In function 'std::vector<int> max_coupons(int, std::vector<int>, std::vector<int>)':
festival.cpp:46:10: error: 'function' is not a member of 'std'
   46 |     std::function<void(int)> dfs = [&](int tokens) {
      |          ^~~~~~~~
festival.cpp:3:1: note: 'std::function' is defined in header '<functional>'; did you forget to '#include <functional>'?
    2 | #include <algorithm>
  +++ |+#include <functional>
    3 | 
festival.cpp:46:19: error: expected primary-expression before 'void'
   46 |     std::function<void(int)> dfs = [&](int tokens) {
      |                   ^~~~
festival.cpp:59:5: error: 'dfs' was not declared in this scope
   59 |     dfs(A);
      |     ^~~