Submission #890967

#	Time	Username	Problem	Language	Result	Execution time	Memory
890967		nikhilg2121	Knapsack (NOI18_knapsack)	C++17	12 / 100	1 ms	460 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
#define ll long long
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vii;
typedef vector<vi> vvi;
typedef vector<pll> vll;
typedef vector<vl> vvl;

#define fori(i, n) for (int i = 0; i < n; i++)
#define ford(i, n) for (int i = n - 1; i >= 0; i--)
#define rep(i, a, b) for (int i = a; i <= b; i++)
#define repd(i, a, b) for (int i = a; i >= b; i--)
#define trav(x, a) for (auto &x : a)
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define eb emplace_back
#define endl '\n'
#define sz(a) (int)(a).size()
#define fi first
#define se second
#define mp make_pair


void solve(){
     int s,n;
     cin>>s>>n;
     vi v(n);
     vi w(n);
     vi k(n);
    fori(i,n){
        cin>>v[i]>>w[i]>>k[i];
    }
    map<int, vii> m;
    fori(i,n){
        m[w[i]].pb({v[i],k[i]});
    }
    vvi dp(2,vi(s+1,0));
    int h = m.size();
       
        int l=1;
        int i=0;
        for(auto x:m){
            int wt = x.fi;
            // cout<<wt<<" c";
            l=!l;
            vii temp = m[wt];
            sort(all(temp),greater<pii>());
            fori(g,sz(temp)){
                if(g!=0)
                temp[g].se += temp[g-1].se;
                // cout<<temp[0].fi<<" "<<temp[0].se<<endl;
            }
            int p=0,t=0;
            rep(j,1,s){
                dp[!l][j] = dp[l][j];
                if(j>=wt){
                    if(j-p*wt>=wt){
                        p++;
                    }
                    while(t<sz(temp) && p>temp[t].se){
                        t++;
                    }
                    if(t<sz(temp))
                    dp[!l][j] = max({dp[!l][j], dp[!l][j-wt]+temp[t].fi, dp[l][j-wt]+temp[0].fi});
                    else
                    dp[!l][j] = max({dp[!l][j], dp[l][j-wt]+temp[0].fi});
                    
                }
                // cout<<dp[!l][j]<<" ";
            }
            // cout<<endl;
            i++;
        }
        int ans=0;
        fori(i,s+1){
            ans = max(ans,dp[h%2][i]);
        }
        // fori(i,n+1){
        //     fori(j,s+1){
        //         cout<<dp[i][j]<<" ";
        //     }
        //     cout<<endl;
        // }
        cout<<ans<<endl;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int t=1;
    // cin >> t;
    while (t--)
    {
        solve();
    }
}

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