Submission #1278705

#	Time	Username	Problem	Language	Result	Execution time	Memory
1278705		jackofall718	Knapsack (NOI18_knapsack)	C++20	100 / 100	42 ms	1672 KiB

knapsack

#include <bits/stdc++.h>
#define ll long long
using namespace std;

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

    int S, N;
    cin >> S >> N;

    vector<vector<pair<int,int>>> A(S+1); // group by weight: (value, count)
    for (int i = 0; i < N; i++) {
        int V, W, K;
        cin >> V >> W >> K;
        if (W <= S) {
            A[W].push_back({V, K});
        }
    }

    vector<ll> dp(S+1, 0);
    ll answer = 0;

    for (int w = 1; w <= S; w++) {
        if (A[w].empty()) continue;
        sort(A[w].begin(), A[w].end(), greater<pair<int,int>>());

        int idx = 0;
        for (int taken = 0; taken < S / w; taken++) {
            if (idx >= (int)A[w].size()) break;

            for (int j = S; j >= w; j--) {
                dp[j] = max(dp[j], dp[j - w] + A[w][idx].first);
                answer = max(answer, dp[j]);
            }

            A[w][idx].second--;
            if (A[w][idx].second == 0) idx++;
        }
    }

    cout << answer << "\n";
    return 0;
}

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