Submission #654584

#	Time	Username	Problem	Language	Result	Execution time	Memory
654584		ArifBillah	Knapsack (NOI18_knapsack)	C++14	100 / 100	90 ms	3828 KiB

knapsack

#include<bits/stdc++.h>
using namespace std;

#define fastio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define vi vector<int>
#define vll vector<ll>
#define vpii vector<pii>
#define vpll vector<pll>
#define vvi vector<vi>
#define ff first
#define ss second
#define endl "\n"
#define pb(x) push_back(x)
#define pp() pop_back()
#define inf LONG_MAX
#define dvg(x) cout<<#x<<" "<<x<<endl;
#define dvg2(x, y) cout<<#x<<" "<<x<<" "<<#y<<" "<<y<<endl;
#define dvgv(x) cout<<#x<<" { "; for(auto i : x) {cout<<i<<" ";} cout<<"}"<<endl;
#define dvgp(x) cout<<#x" {"<<x.ff<<", "<<x.ss<<"}"<<endl;
int dx[] {-1, 0, 1, 0, 1, 1, -1, -1};
int dy[] = {0, 1, 0, -1, 1, -1, 1, -1};

int const N = 1e5 + 10;

int main()
{
  fastio();
   
  int w, n;
  cin>>w>>n;
  map<int, vector<pll>> v;
  for(int i = 0; i < n; i++){
    int wt;
    ll val, amt;
    cin>>val>>wt>>amt;
    v[wt].push_back({val, amt});

  }
  vector<ll> dp(vector<ll>(w + 1, INT32_MIN));
  dp[0] = 0;
  for(auto &[wt, items] : v){
    vector<ll> best = dp;
    sort(items.begin(), items.end(), greater<pll>());
    for(int i = 0; i <= w; i++){
        int copies = 0;
        int type_at = 0;
        int cur_used = 0;
        ll profit = 0;
        while((copies + 1)*wt <= i && type_at < items.size()){
            copies++;
            profit += items[type_at].ff;
            if(dp[i - copies*wt] != INT32_MIN){
                best[i] = max(best[i], dp[i - copies*wt] + profit);
            }
            cur_used++;
            if(cur_used == items[type_at].ss){
                cur_used = 0;
                type_at++;
            }
        }
    }
    dp = best;
  }

  cout<<*max_element(dp.begin(), dp.end())<<endl;

}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:44:13: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   44 |   for(auto &[wt, items] : v){
      |             ^
knapsack.cpp:52:47: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |         while((copies + 1)*wt <= i && type_at < items.size()){
      |                                       ~~~~~~~~^~~~~~~~~~~~~~

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