Submission #1282572

#	Time	Username	Problem	Language	Result	Execution time	Memory
1282572		quan606303	Knapsack (NOI18_knapsack)	C++20	73 / 100	1094 ms	2792 KiB

knapsack

/*
 * @Author: RMQuan 
 * @Date: 2025-10-23 15:47:29 
 * @Last Modified by: RMQuan
 * @Last Modified time: 2025-10-23 21:19:59
 */
/*idea : 



*/
#include <bits/stdc++.h>
bool M1;
#define int long long
#define ll long long
#define INTMAX INT_MAX
#define INTMIN INT_MIN
#define LONGMAX LLONG_MAX
#define LONGMIN LLONG_MIN
#define fi first
#define se second
#define memfull(a,b) memset(a,b,sizeof(a));
#define endl '\n'
#define TASK "TEST"
#define file() if (fopen(TASK".inp","r")){freopen(TASK".inp","r",stdin); freopen(TASK".out","w",stdout);}
using namespace std;
const int MOD=1e9+7;
const int LOG=11;
const int maxn=100005;
int dp[2005],S,n,V[maxn],W[maxn],K[maxn];
int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    file();
    cin>>S>>n;
    for (int i=1;i<=n;i++)cin>>V[i]>>W[i]>>K[i];
    for (int i=1;i<=n;i++)
    {
        vector<int> vt;
        K[i]=min(K[i],S/W[i]);
        for (int j=0;j<=LOG;j++)    
        {
            if (K[i]-(1<<j)>=0)
            {
                K[i]-=(1<<j);
                vt.push_back((1<<j));
            }
            else break;
        }
        if (K[i]>0)vt.push_back(K[i]);
        for (auto j:vt)
        {
            for (int x=S;x>=j*W[i];x--)dp[x]=max(dp[x],dp[x-j*W[i]]+j*V[i]);
        }
    }
    cout<<dp[S];
    bool M2;
    cerr<<"-------------------------------------------------"<<endl;
    cerr<<"Time : "<<clock()<<" ms"<<endl;
    cerr<<"Memory : "<<abs(&M2-&M1)/1024/1024<<" MB"<<endl;
    cerr<<"-------------------------------------------------"<<endl;
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int32_t main()':
knapsack.cpp:25:50: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 | #define file() if (fopen(TASK".inp","r")){freopen(TASK".inp","r",stdin); freopen(TASK".out","w",stdout);}
      |                                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:36:5: note: in expansion of macro 'file'
   36 |     file();
      |     ^~~~
knapsack.cpp:25:81: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 | #define file() if (fopen(TASK".inp","r")){freopen(TASK".inp","r",stdin); freopen(TASK".out","w",stdout);}
      |                                                                          ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:36:5: note: in expansion of macro 'file'
   36 |     file();
      |     ^~~~

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