Submission #587512

#	Time	Username	Problem	Language	Result	Execution time	Memory
587512		KoD	Gift (IZhO18_nicegift)	C++17	100 / 100	520 ms	61148 KiB

nicegift

#include <bits/stdc++.h>

using ll = long long;
using std::vector;
using std::array;
using std::pair;
using std::tuple;

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int N, K;
    std::cin >> N >> K;
    vector<ll> A(N);
    for (auto& x : A) {
        std::cin >> x;
    }
    const ll sum = std::accumulate(A.begin(), A.end(), 0ll);
    const ll max = *std::max_element(A.begin(), A.end());
    const ll turn = sum / K;
    if (sum % K != 0 or max > turn) {
        std::cout << "-1\n";
        return 0;
    }
    ll cur = 0;
    vector<vector<pair<ll, int>>> list = {{}};
    vector<ll> split = {0, turn};
    split.reserve(N + 2);
    for (int i = 0; i < N; ++i) {
        cur += A[i];
        if (cur >= turn) {
            cur -= turn;
            list.back().emplace_back(turn, i);
            list.emplace_back();
        }
        list.back().emplace_back(cur, i);
        split.push_back(cur);
    }
    std::sort(split.begin(), split.end());
    split.erase(std::unique(split.begin(), split.end()), split.end());
    const int Q = (int)split.size() - 1;
    std::cout << Q << '\n';
    vector<int> idx(K);
    for (int i = 0; i < Q; ++i) {
        std::cout << split[i + 1] - split[i];
        for (int j = 0; j < K; ++j) {
            while (list[j][idx[j]].first <= split[i]) {
                idx[j] += 1;
            }
            std::cout << ' ' << list[j][idx[j]].second + 1;
        }
        std::cout << '\n';
    }
    return 0;
}

• Subtask 1: 7 / 7
• Subtask 2: 11 / 11
• Subtask 3: 12 / 12
• Subtask 4: 19 / 19
• Subtask 5: 51 / 51