Submission #1295570

#	Time	Username	Problem	Language	Result	Execution time	Memory
1295570		gramathegod	Knapsack (NOI18_knapsack)	C++20	12 / 100	2 ms	1024 KiB

knapsack

#include <bits/stdc++.h>

using namespace std;

const int N=1e5+5, S=2005;

#define int long long

int dp[2][S], sumpart[S];

signed main()
{
    memset(dp, -1, sizeof(dp));
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int s,n;cin>>s>>n;
    dp[0][0]=0;
    for (int i=1;i<=n;i++){
        int v,w,k,curr=i%2, prev=1-curr;cin>>v>>w>>k;
        memset(sumpart, 0, sizeof(sumpart));
        for (int j=0;j<S;j++){
            dp[curr][j]=-1;
            if (j-w>=0){
                sumpart[j]+=sumpart[j-w];
            }
            if (dp[prev][j]!=-1){
                sumpart[j]++;
            }
        }
        for (int g=0;g+w<S;g++){
            if (dp[curr][g]!=-1){
                if (g-(k-1)*w>=0){
                    int x=0;
                    if (g-k*w>=0){
                        x=sumpart[g-k*w];
                    }
                    if (sumpart[g]-x>0){
                        dp[curr][g+w]=max(dp[curr][g+w], dp[curr][g]+v);
                    }
                }
                else{
                    dp[curr][g+w]=max(dp[curr][g+w], dp[curr][g]+v);
                }
            }
            if (dp[prev][g]==-1)continue;
            dp[curr][g+w]=max(dp[curr][g+w], dp[prev][g]+v);//adding once
        }
        for (int g=0;g<S;g++){
            dp[curr][g]=max(dp[curr][g], dp[prev][g]);
        }
    }
    int ans=0;
    for (int i=0;i<=s;i++){
        ans=max(ans, dp[n%2][i]);
    }
    cout<<ans;
    return 0;
}

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