Submission #1290934

#	Time	Username	Problem	Language	Result	Execution time	Memory
1290934		ssseul	Knapsack (NOI18_knapsack)	C++20	100 / 100	65 ms	34380 KiB

knapsack

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define fi first
#define se second
#define pii pair<int,int>
#define all(a) a.begin(), a.end()
#define el '\n'

const int maxN = 505;
const int base = 311;
const int MOD = 1e9+7;
const int INF = 1e15;
const int NEG_INF = -1e15;
const int MAX_DAYS = 1000;


int n, m, k, q;
string S, T, SS[maxN];
// int dp[maxN][maxN];
vector<int> g[maxN];

void run_test() {
    int S, n;
    cin >> S >> n;

    map<int, vector<pii>> by_weight;

    for(int i = 1; i <= n; i++){
        int val, wei, amt;
        cin >> val >> wei >> amt;
        by_weight[wei].push_back({val, amt});
    }

    vector<vector<int>> best(by_weight.size() + 1,
                                   vector<int>(S + 1, 0));
    best[0][0] = 0;
    int at = 1;

    for(auto[w, items] : by_weight){

        sort(all(items), greater<pii>());

        for(int i = 0; i <= S; i++){
            best[at][i] = best[at-1][i];
            int cnt = 0;
            int item_at = 0;
            int item_used = 0;
            int val = 0;

            while((cnt+1) * w <= i && item_at < items.size()){
                cnt++;
                val += items[item_at].fi;
                best[at][i] = max(best[at][i], best[at-1][i - cnt*w] + val);

                item_used++;
                if(item_used == items[item_at].se){
                    item_at++;
                    item_used = 0;
                }
            }
        }
        at++;
    }

    cout << best.back()[S];
}

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    // freopen("snakes.in", "r", stdin); 
    // freopen("snakes.out", "w", stdout);
    int test = 1;
    // cin >> test;
    while (test-- > 0)
    {
        run_test();
    }
}

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