Submission #985864

#	Time	Username	Problem	Language	Result	Execution time	Memory
985864		vjudge1	Knapsack (NOI18_knapsack)	C++17	29 / 100	3 ms	504 KiB

knapsack

#include <bits/stdc++.h>
using i64 = long long;

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int S, N;
    std::cin >> S >> N;

    std::map<int, std::vector<std::pair<int, int>>> item;
    for (int i = 0; i < N; i++) {
        int v, w, k;
        std::cin >> v >> w >> k;
        
        item[w].push_back({v, k});
    }

    std::vector<i64> dp(1 + S, -1E18);
    dp[0] = 0;

    for (auto &[w, vec] : item) {
        std::sort(vec.begin(), vec.end(), std::greater<std::pair<int, int>>());

        for (int j = S; j >= 0; j--) {
            i64 val = 0;
            for (int c = 0, i1 = 0, i2 = 0; c * w <= S; c++) {
                if (j + c * w <= S) {
                    dp[j + c * w] = std::max(dp[j + c * w], dp[j] + val);
                }

                if (i2 == vec[0].second) {
                    i1++, i2 = 0;
                }

                if (i1 == (int)vec.size()) {
                    break;
                }
                val += vec[i1].first, i2++;
            }
        }
    }

    std::cout << *std::max_element(dp.begin(), dp.end()) << "\n";

    return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 17 / 17
• Subtask 3: 0 / 20
• Subtask 4: 0 / 24
• Subtask 5: 0 / 27