Submission #651830

#	Time	Username	Problem	Language	Result	Execution time	Memory
651830		ash_gamertable	Knapsack (NOI18_knapsack)	C++14	73 / 100	1076 ms	3972 KiB

knapsack

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
 
#define ff              first
#define ss              second
#define int             long long
#define pb              push_back
#define mp              make_pair
#define pii             pair<int,int>
#define vi              vector<int>
#define mii             map<int,int>
#define pqb             priority_queue<int>
#define pqs             priority_queue<int,vi,greater<int> >
#define setbits(x)      __builtin_popcountll(x)
#define zrobits(x)      __builtin_ctzll(x)
#define mod             1000000007
#define inf             1e18
#define ps(x,y)         fixed<<setprecision(y)<<x
#define mk(arr,n,type)  type *arr=new type[n];
#define w(x)            int x; cin>>x; while(x--)
mt19937                 rng(chrono::steady_clock::now().time_since_epoch().count());
#define fastio          ios_base::sync_with_stdio(0); cin.tie(0);
int32_t main()
{
    fastio;
    int s,n;cin>>s>>n;
    vi val(n),wt(n),k(n),prev(s+1,0),cur(s+1,0);
    for(int i=0;i<n;i++) cin>>val[i]>>wt[i]>>k[i];
    // for(int x=1;x<=s;x++)
    // {
    //     ans[x]=ans[x-1];
    //     for(int i=0;i<n;i++)
    //     {
    //         int copies=k[i],j=wt[i],y=x,temp=val[i];
    //         while(copies>0 && y-j>=0)
    //         {
    //             ans[x]=max(ans[x],temp+ans[y-j]);
    //             y-=j;
    //             temp+=val[i];
    //             copies--;
    //         }
    //     }
    //     cout<<x<<" =  "<<ans[x]<<endl;
    // }
    for(int i=0;i<n;i++)
    {
        for(int x=1;x<=s;x++)
        {
            int copies=k[i],j=wt[i],y=x,temp=0;
            // ans[x]=max(ans[x],ans[x-1]);
            while(copies>0 && y-wt[i]>=0)
            {
                y-=wt[i];
                temp+=val[i];
                copies--;
                cur[x]=max(cur[x],temp+prev[y]);
            }
        }
        prev=cur;
        // cout<<cur[1]<<" * "<<cur[2]<<endl;

    }
    cout<<cur[s]<<"\n";
return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int32_t main()':
knapsack.cpp:51:29: warning: unused variable 'j' [-Wunused-variable]
   51 |             int copies=k[i],j=wt[i],y=x,temp=0;
      |                             ^

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