Submission #1216553

#	Time	Username	Problem	Language	Result	Execution time	Memory
1216553		dragon28102008	Knapsack (NOI18_knapsack)	C++20	12 / 100	0 ms	328 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
#define IN "main.inp"
#define OUT "main.out"
#define AC ios_base::sync_with_stdio(false);cin.tie(nullptr); cout.tie(nullptr);

const ll mod = 998244353;

ll s , n;
vector<ll> v , w , k;

ll sub1()
{
    ll res = min(k[0] ,(s/w[0] ) ) * v[0];
    return res;
}

ll sub23()
{
    vector<pair<ll,ll>> a;
    for(ll i = 0 ; i<n ; i++)
    {
        for(ll j = 0 ; j<k[i] ; j++)
        {
            a.push_back({v[i] , k[i]});
        }
    }
    vector<ll> dp(s+1 , 0);
    for(pair<ll,ll> p: a)
    {
        for(ll i = s ; i>=p.second ; i--)
        {
            dp[i] = max(dp[i] , dp[i-p.second] + p.first);
        }
    }
    return dp[s];
}

int main()
{
    if (fopen(IN, "r"))
    {
        freopen(IN, "r", stdin);
        freopen(OUT, "w", stdout);
    }
    AC
    cin>>s>>n;
    for(ll i = 0 ; i<n ; i++)
    {
        ll vi , wi, ki;
        cin>>vi>>wi>>ki;
        v.push_back(vi);
        w.push_back(wi);
        k.push_back(ki);
    }
    if(n == 1) cout<<sub1();
    else cout<<sub23();


    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:45:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |         freopen(IN, "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~
knapsack.cpp:46:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |         freopen(OUT, "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~

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