Submission #1129111

#	Time	Username	Problem	Language	Result	Execution time	Memory
1129111		Climber420	Knapsack (NOI18_knapsack)	C++20	100 / 100	85 ms	2888 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i= 0; i<(n); i++)
#define reps(i,s, n) for(int i= (s); i<(n); i++)
#define each(a, x) for (auto &a : x)
#define vv(T) vector<T>
#define endl '\n'
#define sz(x) (int)x.size()
#define ll long long
#define all(c) begin(c), end(c)
#define fi first
#define se second
#define mp make_pair
#define pb push_back

#define wr cout<<
#define wre wr endl;
#define wrut(a) {wre each(i,(a))wr i<<" "; wre}
#define wrot(a,b,c) {wre wr a<<" "<<b<<" "<<c; wre}
#define int ll
constexpr int K =2e3+1;
vector<pair<int,int>>items[K+1];
int dpn[K], dp[K];
signed main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    
    int n, s; cin>>s>>n;
    int v,w,k;
    
    rep(i,n){
        cin>>v>>w>>k;
        items[w].pb({v,k});
    }
    rep(i,s+1)sort(all(items[i+1]), greater<pair<int,int>>());

    reps(i,1,s+1){
        if (items[i].empty())continue;
        int ile=0, sum=items[i][0].se,done=0;
        while(done*i<=s+1&&ile<sz(items[i])){
            reps(x,1,s+1){
                int &d = dpn[x];
                d= dp[x];
                if (x<i)continue;
                d=max(d,items[i][ile].fi+dp[x-i]);
            }
            sum--;
            done++;
            swap(dp,dpn);
            if (sum==0){
                ile++;
                if (ile==sz(items[i]))break;
                sum=items[i][ile].se;
            }
        }
    }
    wr *max_element(all(dp));
}

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