Submission #1126493

#	Time	Username	Problem	Language	Result	Execution time	Memory
1126493		mazen_ghanayem	Knapsack (NOI18_knapsack)	C++20	0 / 100	2 ms	320 KiB

knapsack

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ull unsigned long long
#define ld long double
#define int long long
#define nl "\n"
#define oo 1e9 + 1
#define OO 1e18 + 1
#define sp ' '
#define sz(x) (int)(x.size())
#define MOD 1000000007
#define fixed(n) fixed << setprecision(n)
#define sub_mod(a, b, m) ((((a) % m) - ((b) % m) + m) % m)
#define add_mod(a, b, m) ((((a) % m) + ((b) % m)) % m)
#define mult_mod(a, b, m) ((((a) % m) * ((b) % m)) % m)
#define EPS 1e-9
#define PI acos(-1)
using namespace __gnu_pbds;
using namespace std;
void fastio()
{
    ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
    #endif
}
void solve(int tc)
{
    int s, n;
    cin >> s >> n;
    vector<int> w(n * 12 + 5);
    vector<int> v(n * 12 + 5);
    int cnt = 1;
    while(n--){
        int weight, value, q;
        cin >> value >> weight >> q;
        int k = 1;
        while(k <= q && k * weight <= s){
            w[cnt] = weight * k;
            v[cnt] = value * k;
            q -= k;
            k *= 2;
            cnt++;
        }
        if(q > 0 && q * weight <= s){
            w[cnt] = weight * q;
            v[cnt] = weight * q;
            cnt++;
        }
    }
    n = cnt;
    vector<vector<int>> dp(n + 5, vector<int>(s + 5));
    dp[0].assign(s + 5, 0);
    for(int i = 1; i <= n; i++){
        for(int ww = 0; ww <= s; ww++){
            dp[i][ww] = dp[i - 1][ww];
            if(ww >= w[i])
                dp[i][ww] = max(dp[i][ww], dp[i - 1][ww - w[i]] + v[i]);
        }
    }
    cout << dp[n][s] << nl;
}
signed main(void)
{
    fastio();
    int tc = 1;
    //cin >> tc;
    int i = 1;
    while (tc--)
    {
        // cout<<"Case #"<<i<<": ";
        solve(i++);
    }
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void fastio()':
knapsack.cpp:26:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |         freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:26:50: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |         freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
      |                                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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