Submission #1090214

#	Time	Username	Problem	Language	Result	Execution time	Memory
1090214		vjudge1	Knapsack (NOI18_knapsack)	C++17	29 / 100	1 ms	760 KiB

knapsack

#include <bits/stdc++.h>
#define int long long
#define pii pair<int, int>
using namespace std;

const int N = 1e5 + 5, MAX = 2e3 + 5, MOD = 1e9 + 7, INF = 1e18 + 5;;

int s, n, v[N], w[N], k[N], dp[N];
vector<pii> items[MAX];
vector<pii> fin;
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> s >> n;
    for(int i = 1; i <= n; i++){
        cin >> v[i] >> w[i] >> k[i];
        items[w[i]].push_back({v[i], k[i]});
    }

    for(int i = 1; i <= s; i++){
        sort(items[i].rbegin(), items[i].rend());
        int needed = ((s + i - 1) / i);

        for(pii item : items[i]){
            int used = min(needed, item.second);
            needed -= item.second;

            int cnt = 1;
            while(used >= cnt){
                fin.push_back({i * cnt, item.first * cnt});
                used -= cnt; cnt *= 2;
            }
            if(used) fin.push_back({i * used, item.first * used});
            if(needed == 0) break;
        }
    }

    for(int i = 0; i <= s; i++) dp[i] = -INF;
    dp[0] = 0;
    int sum = 0;
    for(pii item : fin){
        for(int i = min(sum, s - item.first); i >= 0; i--){
            dp[i + item.first] = max(dp[i + item.first], dp[i] + item.second);
        }
        sum += item.first;
    }
    cout << *max_element(dp, dp + s + 1);
    return 0;
}

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