Submission #1190263

#	Time	Username	Problem	Language	Result	Execution time	Memory
1190263		hikari1234	Knapsack (NOI18_knapsack)	C++20	100 / 100	50 ms	3144 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ff first
#define ss second
int S,n;
vector<pair<int,int>> we[2005];
vector<int> dp(2005,-1);
vector<pair<int,int>> items;
signed main(){
    ios::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
    cin>>S>>n;
    for(int i=1; i<=n; i++){
        int v,w,k;
        cin>>v>>w>>k;
        we[w].push_back({v,k});
    }
    for(int i=1; i<=S; i++){
        sort(we[i].begin(),we[i].end(),greater<pair<int,int>>());
        int lim=S/i;
        bool yes=0;
        for(int j=0; j<we[i].size(); j++){
            while(we[i][j].second--){
                items.push_back({i,we[i][j].first});
                lim--;
                if(lim==0){
                    yes=1;
                    break;
                }
            }
            if(yes) break;
        }
    }
    // for(pair<int,int> i: items){
    //     cout<<i.first<<" "<<i.second<<endl;
    // }
    dp[0]=0;
    for(int i=0; i<items.size(); i++){
        for(int j=S; j>=0; j--){
            if(dp[j]!=-1 and j+items[i].first<=S){
                dp[j+items[i].first]=max(dp[j+items[i].first],dp[j]+items[i].second);
            }
        }
    }
    int ans=0;
    for(int i=0; i<=S; i++){
        ans=max(ans,dp[i]);
    }
    cout<<ans<<endl;
}

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