Submission #987548

#	Time	Username	Problem	Language	Result	Execution time	Memory
987548		vjudge1	Knapsack (NOI18_knapsack)	C++17	100 / 100	54 ms	3920 KiB

knapsack

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define endl "\n"
int n, m;
vector<vector<pair<int, int> > > a;
ll dp[20005];
vector<pair<int, int> > c;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> m >> n;
    a.assign(m + 1, {});
    for (int i = 1; i <= n; i++)
    {
        int v, w, k;
        cin >> v >> w >> k;
        a[w].push_back({v, k});
    }
    for (int i = 1; i <= m; i++)
    {
        sort(a[i].begin(), a[i].end(), greater<pair<int,int> >());
    }
    for (int i = 1; i <= m; i++)
    {
        int dem = m / i;
        for (auto [v, k] : a[i])
        {
            if (dem == 0) break;
            while (k != 0 && dem != 0)
            {
                c.push_back({i, v});
                k--;
                dem--;
            }
        }
    }
    // for (auto [i, v] : c)
    // {
    //     cout << i << " ";
    // }
    // cout << endl;
    for (auto [i, v] : c)
    {
        for (int j = m; j >= i; j--)
        {
            if (dp[j - i] != 0 || j == i) dp[j] = max(dp[j], dp[j - i] + v);
        }
    }
    cout << *max_element(dp + 1, dp + m + 1);
}

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