Submission #1268477

#	Time	Username	Problem	Language	Result	Execution time	Memory
1268477		herominhsteve	Knapsack (NOI18_knapsack)	C++20	73 / 100	1095 ms	488 KiB

knapsack

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

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

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

    vector<long long> dp(S+1, -1e18);
    dp[0] = 0;

    for (int i=0; i<N; i++) {
        long long v;
        int w, k;
        cin >> v >> w >> k;

      
        for (int r=0; r<w; r++) {
            deque<pair<int,long long>> dq;
            
            for (int m=0; r+m*w<=S; m++) {
                int weight = r + m*w;
                long long val = dp[weight] - 1LL * m * v;

              
                while (!dq.empty() && dq.back().second <= val) dq.pop_back();
                dq.emplace_back(m, val);

                
                while (!dq.empty() && dq.front().first < m - k) dq.pop_front();

                
                dp[weight] = dq.front().second + 1LL * m * v;
            }
        }
    }

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

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