Submission #1036797

#	Time	Username	Problem	Language	Result	Execution time	Memory
1036797		ocasu	Knapsack (NOI18_knapsack)	C++17	37 / 100	1094 ms	488 KiB

knapsack

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

#define int long long

const int inf=1e12;

signed main(){
    int S,n; cin>>S>>n;

    vector<multiset<int>> items(S+1);
    for (int i=0; i<n; i++){
        int v,w,k; cin>>v>>w>>k;
        while (k>0 and (items[w].size()<=(S/w) or *(items[w].begin()) <= v)){
            items[w].insert(v);
            if ((int)(items[w].size()) > S/w) items[w].erase(items[w].begin());
            k--;
        }
    }

    vector<int> dp(S+1,-inf); //current maximum value of a subset with total weight w
    dp[0]=0;

    for (int w=0; w<=S; w++){
        for (auto v: items[w]){
            for (int i=S; i>=w; i--){
                dp[i]=max(dp[i], dp[i-w]+v);
            }
        }
    }
    int ans=0;
    for (auto i: dp) ans=max(ans, i);
    cout<<ans<<'\n';


}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:14:40: warning: comparison of integer expressions of different signedness: 'std::multiset<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   14 |         while (k>0 and (items[w].size()<=(S/w) or *(items[w].begin()) <= v)){
      |                         ~~~~~~~~~~~~~~~^~~~~~~

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