Submission #716214

#	Time	Username	Problem	Language	Result	Execution time	Memory
716214		Toxtaq	Knapsack (NOI18_knapsack)	C++17	49 / 100	1078 ms	96068 KiB

knapsack

#include<bits/stdc++.h>
using namespace std;
struct Item{
    int value, weight, quantity;
};
vector<int>weights, values;
//vector<vector<long long> >table;
map<pair<int, int>, long long>table;
long long rec(int indx, int W){
    if(W < 0)return -1e18;
    if(indx == weights.size() || W == 0)return 0;
    if(table.count({indx, W}))return table[{indx, W}];
    return table[{indx, W}] = max(rec(indx + 1, W - weights[indx]) + values[indx], rec(indx + 1, W));
}
int main()
{
    int S, n;
    cin >> S >> n;
    vector<Item>items;
    for(int i = 0;i < n;++i){
        int v, w, q;
        cin >> v >> w >> q;
        q = min(q, S / w);
        Item cur;
        cur.value = v;
        cur.weight = w;
        cur.quantity = q;
        items.push_back(cur);
    }
    for(int i = 0;i < n;++i){
        int v = items[i].value, w = items[i].weight, q = items[i].quantity;
        for(int j = 0;j < q;++j){
            weights.push_back(w);
            values.push_back(v);
        }
    }
//    table.assign(S + 1, vector<long long>(weights.size(), -1));
    cout << rec(0, S);
}

Compilation message (stderr)

knapsack.cpp: In function 'long long int rec(int, int)':
knapsack.cpp:11:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |     if(indx == weights.size() || W == 0)return 0;
      |        ~~~~~^~~~~~~~~~~~~~~~~

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