Submission #890567

#	Time	Username	Problem	Language	Result	Execution time	Memory
890567		Flan312	Knapsack (NOI18_knapsack)	C++17	49 / 100	3 ms	600 KiB

knapsack

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define eb emplace_back
#define task ""
#define fast ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
#define nx freopen (task".inp","r",stdin), freopen (task".out","w",stdout);
#define fi first
#define se second
#define pii pair <int, int>
#define tii tuple <int, int, int>
using namespace std;
const int nmax = 2002;
int s, n, v[nmax], w[nmax], k[nmax];
int mxk = 0;
void sub23()
{
    vector <ll> dp(nmax, 0);
    for (int i = 1; i <= n; ++i)
        for (int j = s; j >= w[i]; --j)
            for (int use = k[i]; use >= 0; --use)
                if (j >= 1ll * w[i] * use)
                    dp[j] = max(dp[j], dp[j - w[i] * use] + 1ll * v[i] * use);
    cout << dp[s];
    exit(0);
}
int main()
{
    if (ifstream(task".inp")) nx
    fast
    cin >> s >> n;
    for (int i = 1; i <= n; ++i)
        cin >> v[i] >> w[i] >> k[i],
        mxk = max(mxk, k[i]);
    if (n == 1) return cout << 1ll * v[1] * min(s / w[1], k[1]), 0;
    if (n <= 100 && mxk <= 10) sub23();
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:7:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 | #define nx freopen (task".inp","r",stdin), freopen (task".out","w",stdout);
      |            ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:29:31: note: in expansion of macro 'nx'
   29 |     if (ifstream(task".inp")) nx
      |                               ^~
knapsack.cpp:7:52: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 | #define nx freopen (task".inp","r",stdin), freopen (task".out","w",stdout);
      |                                            ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:29:31: note: in expansion of macro 'nx'
   29 |     if (ifstream(task".inp")) nx
      |                               ^~

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