Submission #1124263

#	Time	Username	Problem	Language	Result	Execution time	Memory
1124263		wrtt	Knapsack (NOI18_knapsack)	C++20	73 / 100	1096 ms	2832 KiB

knapsack

#include "bits/stdc++.h"

using namespace std;

#define int long long
#define pb emplace_back
#define mx(a, b) ((a) > (b) ? (a) : (b))
#define mn(a, b) ((a) < (b) ? (a) : (b))
#define graph(n) vector<int> g[(n)+1];
constexpr int mod = 998244353;
constexpr int inf = 1e18;

void frx(std::string name) {
  freopen((name + ".in").c_str(), "r", stdin);
  freopen((name + ".out").c_str(), "w", stdout);
}

/*
template <typename T, size_t N>
ostream &operator<<(ostream &os, const T (&arr)[N]) {
  os << "[";
  for(size_t i = 0; i < N; ++i) {
    if(i>0) {
      os << ", ";
    }
    os<<arr[i];
  }
  return os << "]";
}
*/

void solve() {
  int s,n;
  cin>>s>>n;
  int v[n], w[n], k[n];
  for(int i = 0; i < n; ++i) {
    cin>>v[i]>>w[i]>>k[i];
  }
  if(n==1) {
    cout<<(mn(s/w[0], k[0])*v[0])<<"\n";
    return;
  }
  int dp[s+1];
  memset(dp,0,sizeof(dp));
  for(int i = 0; i < n; ++i) {
    for(int mod = 0; mod < w[i]; ++mod) {
      deque<pair<int,int>> q;
      for(int j = mod, cnt = 0; j<=s; j+=w[i], ++cnt) {
        if(!q.empty() && q.front().second < cnt-k[i]) {
          q.pop_front();
        }
        int curr = dp[j] - cnt*v[i];
        while(!q.empty() && q.back().first <= curr) {
          q.pop_back();
        }
        q.emplace_back(curr,cnt);
        dp[j] = q.front().first+cnt*v[i];
      }
    }
  }
  cout<<dp[s]<<"\n"; 
}

  
signed main() {
    std::ios_base::sync_with_stdio(false);
    //std::cin.tie(nullptr);
    //frx("piggyback");
    #ifdef LOCAL  
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout); 
    auto start = std::chrono::high_resolution_clock::now();
    #endif
    int t = 1;
    //cin >> t;
    int curr = 1;
    while (t--) {
      //cout<<"Case "<<curr<<"\n";
      ++curr;
        solve();
    }
    #ifdef LOCAL
    auto end = std::chrono::high_resolution_clock::now();
    std::chrono::duration<double> elapsed = end - start;
    std::cout << elapsed.count() << " seconds\n";
    #endif
    return 0;  
}

Compilation message (stderr)

knapsack.cpp: In function 'void frx(std::string)':
knapsack.cpp:14:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |   freopen((name + ".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:15:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |   freopen((name + ".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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