Submission #965212

#	Time	Username	Problem	Language	Result	Execution time	Memory
965212		Elliot_7002	Knapsack (NOI18_knapsack)	C++14	100 / 100	79 ms	5132 KiB

knapsack

#include <iostream>
#include <bits/stdc++.h> 
using namespace std;
typedef tuple<int,int,int> triad;
#define int long long
#define INF 1e9
int s,n,val,weight,occ,ans;
vector<int> dp;
vector<vector<tuple<int,int>>> items;
bool update(int value, int w,int att){
    if(att*w > s){
      return false;
    }
    for(int i = dp.size()-w-1; i >= 0; i--){
        dp[i + w] = max(dp[i+w], dp[i] + value);
    }
    return true;
}
int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> s >> n;
    dp.resize(s+1);
    items.resize(s+1);
    //int mod = 1e9+7;
    dp[0] = 0;
    for(int i = 0; i < n; i++){
        cin >> val >> weight >> occ;
        if(weight > s){
          continue;
        }
        items[weight].push_back({val,occ});
    }
    for(int i = 0; i <= s; i++){
        sort(items[i].begin(), items[i].end());
        bool help = true;
        int att = 1;
        for(int j = items[i].size() - 1; j >= 0 && help; j--){
            val = get<0>(items[i][j]);
            occ = get<1>(items[i][j]);          
            while(occ-- && help){
                help = update(val,i,att);
                att++;
            }
        }
    }
    ans = dp[s];
    cout << ans;
    return 0;

    
}

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