Submission #1265290

#	Time	Username	Problem	Language	Result	Execution time	Memory
1265290		uzukishinobu	Knapsack (NOI18_knapsack)	C++20	100 / 100	97 ms	28108 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
long long f[2005];
vector<int> w;
vector<int> v;

int a,b;
vector<int> pos[1000005];
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> b >> a;
    for (int i=1;i<=a;i++){
         int x,y,t;
         cin >> y >> x >> t;
         t=min(b/x,t);
         int pow=1;
         while (t>=pow ){
             t-=pow;
             int val=y*pow;
             int cost=x*pow;
             pos[cost].push_back(val);
             pow*=2;
         }
         if (t>0){
             int val=y*t;
             int cost=x*t;
             pos[cost].push_back(val);
         }
    }
    for (int i=1;i<=b;i++){
         if (pos[i].size()==0){
             continue;
         }
         sort(pos[i].rbegin(),pos[i].rend());
    }
    for (int j=1;j<=b;j++){
         
         for (int i=b;i>=1;i--){
              int prefix=0;
              int cur=0;
              int cur1=0;
              while (cur1<pos[j].size() && i-cur-j>=0){
                   cur+=j;
                   prefix+=pos[j][cur1];
                   f[i]=max(f[i],f[i-cur]+prefix);
                   cur1++;
              }
         }
    }
    cout << f[b] << "\n";
    return 0;
}

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