Submission #1320294

#	Time	Username	Problem	Language	Result	Execution time	Memory
1320294		kawhiet	Knapsack (NOI18_knapsack)	C++20	100 / 100	128 ms	33424 KiB

knapsack

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

#ifdef LOCAL
#include "debug.h"
#else
#define dbg(...) 47
#endif

constexpr int N = 2001;
constexpr long long inf = 1e18;

vector<array<int, 2>> f[N];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int s, n;
    cin >> s >> n;
    for (int i = 0; i < n; i++) {
        int v, w, k;
        cin >> v >> w >> k;
        f[w].push_back({v, k});
    }
    vector<vector<long long>> dp(s + 1, vector<long long>(s + 1, 0));
    for (int i = 1; i <= s; i++) {
        sort(f[i].rbegin(), f[i].rend());
        for (int j = 1; j <= s; j++) {
            auto b = f[i];
            dp[i][j] = dp[i - 1][j];
            long long sum = 0;
            int id = 0, taken = 0;
            for (int k = 1; k * i <= j; k++) {
                if (id == b.size()) break;
                if (id < b.size() && taken == b[id][1]) {
                    k--;
                    id++;
                    taken = 0;
                    continue;
                }
                sum += b[id][0];
                taken++;
                dp[i][j] = max(dp[i][j], dp[i - 1][j - k * i] + sum);
            }
        }
    }
    cout << ranges::max(dp[s]) << '\n';
    return 0;
}

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