Submission #1258259

#	Time	Username	Problem	Language	Result	Execution time	Memory
1258259		alizhan	Knapsack (NOI18_knapsack)	C++20	73 / 100	1093 ms	1572 KiB

knapsack

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

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int s, n;
    cin >> s >> n;
    vector<int> dp(s + 1, -1e18);
    vector<pair<int, int>> g[2010];  

    for(int i = 0; i < n; ++i) {
        int v, w, k;
        cin >> v >> w >> k;
        if(w <= s) {  
            g[w].push_back({v, k});
        }
    }

    for(int i = 1; i <= s; ++i) {
        sort(g[i].begin(), g[i].end(), greater<pair<int, int>>());
    }

    dp[0] = 0;  

    for(int i = 1; i <= s; ++i) {
        for(auto& item : g[i]) {
            int v = item.first;
            int k = item.second;
            int max_take = min(k, s / i);
            
            for(int x = 1; x <= max_take; ++x) {
                for(int j = s; j >= i; --j) {
                    if(dp[j - i] != -1e18) {
                        dp[j] = max(dp[j], dp[j - i] + v);
                    }
                }
            }
        }
    }

    int mx = 0;
    for(int i = 0; i <= s; ++i) {
        mx = max(mx, dp[i]);
    }
    cout << mx << endl;

    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:10:27: warning: overflow in conversion from 'double' to 'std::vector<int>::value_type' {aka 'int'} changes value from '-1.0e+18' to '-2147483648' [-Woverflow]
   10 |     vector<int> dp(s + 1, -1e18);
      |                           ^~~~~

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