Submission #900199

#	Time	Username	Problem	Language	Result	Execution time	Memory
900199		aykhn	Knapsack (NOI18_knapsack)	C++17	100 / 100	44 ms	4992 KiB

knapsack

#include <bits/stdc++.h>

// author: aykhn

using namespace std;
typedef long long ll;

#define all(v) v.begin(), v.end()
#define pii pair<int, int>
#define mpr make_pair
#define eb emplace_back
#define pb push_back
#define ts to_string
#define fi first
#define se second
#define ins insert
#define int ll
#define inf 0x3F3F3F3F
#define infll 0x3F3F3F3F3F3F3F3FLL
#define bpc __builtin_popcount

const int MXN = 2e3 + 5;

int dp[MXN];
vector<array<int, 2>> a[MXN];

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(nullptr);
    int s, n;
    cin >> s >> n;
    for (int i = 1; i <= n; i++)
    {
        int v, w, k;
        cin >> v >> w >> k;
        a[w].pb({v, k});
    }
    for (int i = 1; i <= s; i++)
    {
        sort(all(a[i]));
        int take = s / i;
        while (take-- && !a[i].empty())
        {
            for (int j = s; j >= i; j--)
            {
                dp[j] = max(dp[j], dp[j - i] + a[i].back()[0]);
            }
            if (!--a[i].back()[1]) a[i].pop_back();
        }
    }
    cout << *max_element(dp, dp + MXN) << '\n';
}

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