Submission #676068

#	Time	Username	Problem	Language	Result	Execution time	Memory
676068		madtuber	Knapsack (NOI18_knapsack)	C++14	29 / 100	2 ms	1108 KiB

knapsack

#include <bits/stdc++.h>
#define all(x) begin(x),end(x)
#define fir first
#define sec second
#define sz(x) x.size()
#define pb push_back
 
using namespace std;
using ll = long long;
using vi = vector<int>;
using pi = pair<int,int>;
using pdb = pair<double,double>;
using pll = pair<ll,ll>;
using vll = vector<ll>;
const double EPS = (1e-6);
 
void setio(string s){
    freopen((s + ".in").c_str(),"r",stdin);
    freopen((s + ".out").c_str(),"w",stdout);
}

struct Item{
    int v, w, k;
};

const int MXN = 1e5+1;
const int MXS = 2001;
int dp[MXN][MXS];

void solve(){
    int s, n;
    cin >> s >> n;

    vector<Item> a(n);
    for(auto& i :a){
        cin >> i.v >> i.w >> i.k;
    }
    
    for(int i{1}; i <= n; i++){
        for(int j{}; j <= s; j++){
            dp[i][j] = max(dp[i][j], dp[i-1][j]);
            int mx = min((s-j)/a[i-1].w, a[i-1].k);
            dp[i][j+mx*a[i-1].w] = max(dp[i][j+mx*a[i-1].w], dp[i-1][j] + mx*a[i-1].v);
        }
    }

    cout << dp[n][s];
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int t = 1;
    while(t--){
        solve();
    }
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void setio(std::string)':
knapsack.cpp:18:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |     freopen((s + ".in").c_str(),"r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:19:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     freopen((s + ".out").c_str(),"w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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