Submission #1304113

#	Time	Username	Problem	Language	Result	Execution time	Memory
1304113		Zone_zonee	Knapsack (NOI18_knapsack)	C++20	100 / 100	63 ms	3040 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int N = 1e5+10, S = 2e4+10;

ll dp[S];
vector<pair<ll, ll>> by_w[S];
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int s, n;
    cin >> s >> n;
    int sz = 0;
    for(int i = 1; i <= n; ++i){
        ll v, w, k;
        cin >> v >> w >> k;
        by_w[w].push_back({v, k});
    }
    for(int i = 1; i <= s; ++i){
        sort(by_w[i].begin(), by_w[i].end(), greater<pair<ll, ll>>());
        ll took = 0;
        for(auto [v, k] : by_w[i]){
            for(int j = 1; j <= k && took <= s; ++j, took += i){
                for(int l = s; l >= i; --l){
                    dp[l] = max(dp[l], dp[l-i] + v);
                }
            }
            if(took > s) break;
        }
    }
    cout << dp[s] << '\n';
}

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