Submission #1268475

#	Time	Username	Problem	Language	Result	Execution time	Memory
1268475		herominhsteve	Knapsack (NOI18_knapsack)	C++20	37 / 100	1 ms	328 KiB

knapsack

#include <bits/stdc++.h>
#define el '\n'
using namespace std;

struct Goods {
    int w;
    long long val;
    Goods(int W,long long V): w(W), val(V) {}
};

int S, N;
vector<Goods> goods;

void init() {
    cin >> S >> N;
    for (int i=0;i<N;i++) {
        long long v;
        int w, k;
        cin >> v >> w >> k;
        int pow2 = 1;
        while (k > 0) {
            int take = min(pow2, k);
            int newW = w * take;
            long long newVal = v * 1ll * take;

            if (newW <= S) {
                goods.emplace_back(newW, newVal);
            }

            k -= take;
            pow2 <<= 1;
        }
    }
}

void sol() {
    vector<long long> dp(S+1, 0);
    for (Goods x : goods) {
        int w  = x.w;
        long long val = x.val;
        for (int j=S; j>=w; j--) {
            dp[j] = max(dp[j], dp[j-w] + val);
        }
    }
    cout << *max_element(dp.begin(), dp.end()) << el;
}

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

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