Submission #1175516

#	Time	Username	Problem	Language	Result	Execution time	Memory
1175516		vyaduct	Knapsack (NOI18_knapsack)	C++20	17 / 100	27 ms	332 KiB

knapsack

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

void setIo(string in="", string out=""){
  if (!in.empty() && !out.empty()){
    freopen(in.c_str(), "r", stdin);
    freopen(out.c_str(), "w", stdout);
  }
  ios::sync_with_stdio(false);
  cin.tie(0);
}
 
#define all(c)      (c).begin(), (c).end()
#define sz(c)       (int)(c).size()
#define vt          vector
#define pb          push_back
#define F           first
#define S           second

void solve(){
  int n,s; cin>>s>>n;
  vt<ll> v(n), w(n), k(n);
  vt<ll> dp(s+1, 0);
  for (int i=0;i<n;i++){
    cin>>v[i]>>w[i]>>k[i];
  }
  for (int i=0;i<n;i++){
    for (int cn=1;cn<=k[i];cn++){
      ll value = v[i] * cn;
      ll weight = w[i] * cn;

      for (int x=s;x>=weight;x--){
        dp[x] = max(dp[x], dp[x-weight]+value);
      }
    }
  }
  cout << dp[s] << endl;
}


int main() {
  setIo();
  int tt=1; 
  // cin>>tt;
  while(tt--) solve();
  return 0;
} 

Compilation message (stderr)

knapsack.cpp: In function 'void setIo(std::string, std::string)':
knapsack.cpp:7:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 |     freopen(in.c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:8:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |     freopen(out.c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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