Submission #1254494

#	Time	Username	Problem	Language	Result	Execution time	Memory
1254494		shakilinnovate	Knapsack (NOI18_knapsack)	C++20	73 / 100	1095 ms	416 KiB

knapsack

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

int main() {
    ll S, N;
    cin >> S >> N;

    vector<ll> dp(S + 1, 0); // Start with 0, no items taken

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

        // ✅ Treat as unbounded knapsack if weight × k exceeds capacity
        if (w * k >= S) {
            for (ll j = w; j <= S; j++) {
                dp[j] = max(dp[j], dp[j - w] + v);
            }
        }
        else {
            // Binary optimization for bounded knapsack
            for (ll cnt = 1; k > 0; cnt <<= 1) {
                ll take = min(cnt, k);
                k -= take;

                ll totalValue = v * take;
                ll totalWeight = w * take;

                for (ll j = S; j >= totalWeight; j--) {
                    dp[j] = max(dp[j], dp[j - totalWeight] + totalValue);
                }
            }
        }
    }

    cout << *max_element(dp.begin(), dp.end()) << endl;
}

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