Submission #1278939

#	Time	Username	Problem	Language	Result	Execution time	Memory
1278939		SSKMF	Knapsack (NOI18_knapsack)	C++20	100 / 100	102 ms	1788 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;

vector < pair <int , int> > candidati[2001] , sir[2001];
int maxim[2001] , temporar[2001] , stanga[2001];

int main ()
{
    ios :: sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);

    int limita , optiuni;
    cin >> limita >> optiuni;

    for (int indice = 1 ; indice <= limita ; indice++)
        { maxim[indice] = -1; }

    while (optiuni--)
    {
        int valoare , greutate , __limita;
        cin >> valoare >> greutate >> __limita;
        sir[greutate].emplace_back(valoare , __limita);
    }

    for (int greutate = 1 ; greutate <= limita ; greutate++)
    {
        sort(sir[greutate].begin() , sir[greutate].end() , greater < pair <int , int> > ());

        int suma = 0 , indice = 0;
        while (indice < (int)sir[greutate].size() && suma < limita / greutate)
            { suma += sir[greutate][indice++].second; }

        sir[greutate].resize(indice);
    }

    for (int greutate = 1 ; greutate <= limita ; greutate++) {
        for (auto& termen : sir[greutate])
        {
            int& valoare = termen.first;
            int& __limita = termen.second;
            
            for (int indice = 0 ; indice < greutate ; indice++)
                { candidati[indice].clear(); stanga[indice] = 0; }

            for (int indice = 0 , __indice = 0 ; indice <= limita ; indice++)
            {
                if (stanga[__indice] < (int)candidati[__indice].size() && (indice - candidati[__indice][stanga[__indice]].second) / greutate > __limita)
                    { stanga[__indice]++; }

                temporar[indice] = max(maxim[indice] , stanga[__indice] >= (int)candidati[__indice].size() ? -1 : candidati[__indice][stanga[__indice]].first + indice / greutate * valoare);

                if (maxim[indice] != -1)
                {
                    pair <int , int> actual = {maxim[indice] - indice / greutate * valoare , indice};
                    while (stanga[__indice] < (int)candidati[__indice].size() && candidati[__indice].back().first <= actual.first)
                        { candidati[__indice].pop_back(); }

                    candidati[__indice].push_back(actual);
                }

                if (++__indice == greutate)
                    { __indice = 0; }
            }
            
            for (int indice = 0 ; indice <= limita ; indice++)
                { maxim[indice] = temporar[indice]; }
        }
    }

    int rezultat = 0;
    for (int indice = 1 ; indice <= limita ; indice++)
        { rezultat = max(rezultat , maxim[indice]); }
    
    cout << rezultat;
    return 0;
}

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