Submission #438637

#	Time	Username	Problem	Language	Result	Execution time	Memory
438637		Haidara	Knapsack (NOI18_knapsack)	C++17	12 / 100	1 ms	264 KiB

knapsack

/* * * * * * * * * *
 *   ID: Haidara   *
 *   LANG: C++17   *
 *   PROB:         *
 * * * * * * * * * */
#include<bits/stdc++.h>
#define fast ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define int long long
#define rep(i,x,n) for(int i=x;i<n;i++)
#define FOR(i,n) rep(i,0,n)
#define per(i,x,n) for(int i=x;i>n;i--)
#define ROF(i,x) for(int i=x;i>=0;i--)
#define v(i) vector< i >
#define p(i,j) pair< i , j >
#define pii pair<int,int>
#define m(i,j) map< i , j >
#define pq(i) priority_queue< i >
#define ff first
#define all(x) x.begin(),x.end()
#define ss second
#define pp push_back
using namespace std;
void SIO(string name="")
{
    if(name!="")
    {
        freopen((name+".in").c_str(),"r",stdin);
        freopen((name+".out").c_str(),"w",stdout);
    }
}
const int inf=1LL<<62LL;
const int mod=1e9+7;
const int maxn=100001;
int s,n,k[maxn],dp[2001];
pii a[maxn];
int solve(int inx=0,int curr=0)
{
    if(dp[curr])
        return dp[curr];
    if(inx==n)
        return 0;
    FOR(i,k[inx]+1)
    {
        if(curr+i*a[inx].ss<=s)
            dp[curr]=max(dp[curr],solve(inx+1,curr+i*a[inx].ss)+i*a[inx].ff);
        else
            break;
    }
    return dp[curr];
}
signed main()
{
    SIO("");
    cin>>s>>n;
    FOR(i,n)
    {
        cin>>a[i].ff>>a[i].ss>>k[i];
        k[i]=min(k[i],s/a[i].ss);
    }
    sort(a,a+n);
    cout<<solve();
}

Compilation message (stderr)

knapsack.cpp: In function 'void SIO(std::string)':
knapsack.cpp:27:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |         freopen((name+".in").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:28:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |         freopen((name+".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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