Submission #492505

#	Time	Username	Problem	Language	Result	Execution time	Memory
492505		rocww	Knapsack (NOI18_knapsack)	C++14	100 / 100	67 ms	3608 KiB

knapsack

#include<bits/stdc++.h>
using namespace std;
#define sz(x) (int)x.size()
#define pb push_back
#define mp make_pair
#define ll long long 
#define lli long long
#define mod 1000000007
#define mod2 998244353
#define si size()
#define dou double
 
void fast(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
}
 
/*void init_code(){
    #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif 
}*/

 
int main(){
  fast();
  //init_code();
 
  int s,n;
  cin>>s>>n;
  long long cnt[s+5]={0};
  //long long lol[s+5]={0};
  int memo[s+5]={0};
  memo[0]=1;
  vector<pair<long long,long long>> time[s+5];
  for(int i=1;i<=n;i++){
    long long int v,w,k;
    cin>>v>>w>>k;
    /*for(int j=s;j>=0;j--){
        if(memo[j]){
            if(j+w<=s){
                cnt[j+w]=max(cnt[j]+v,cnt[j+w]);
                memo[j+w]=1;
            }
        }
    }
    k--;*/
    k=min(s/w+1,k);
    time[w].push_back({v,k});
    
    
  }
  
  for(int i=1;i<=s;i++){
      sort(time[i].begin(),time[i].end());
  }
  
  for(int i=1;i<=s;i++){
      vector<pair<ll,ll>> v=time[i];
      int count=s/i;
      while(!v.empty() && count>0){
          int lol=v.back().second;
          lol=min(count,lol);
          long long val=v.back().first;
          for(int j=0;j<lol;j++){
              for(int k=s-i;k>=0;k--){
                  if(memo[k]){
                      cnt[k+i]=max(cnt[k]+val,cnt[k+i]);
                      memo[k+i]=1;
                  }
              }
          }
          v.pop_back();
          count-=lol;
      }
  }
  long long ans=0;
  for(int i=0;i<=s;i++){
    ans=max(cnt[i],ans);
  }
  cout<<ans<<"\n";




 
}

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