Submission #917478

#	Time	Username	Problem	Language	Result	Execution time	Memory
917478		PieArmy	Knapsack (NOI18_knapsack)	C++17	29 / 100	2 ms	468 KiB

knapsack

#include <bits/stdc++.h>
#define fr first
#define sc second
#define pb push_back
#define endl '\n';
typedef long long ll;
const ll inf=2000000000000000005;
using namespace std;
ll pie(ll army){return (1ll<<army);}
ll fpow(ll x,ll y,ll m=0){if(y<0){cout<<"powError";return -1;}if(m)x%=m;ll res=1;while(y>0){if(y&1)res*=x;x*=x;if(m){x%=m;res%=m;}y>>=1;}return res;}

void code(){
    int k,n;cin>>k>>n;
    int v2[n],w2[n],cnt2[n];
    for(int i=0;i<n;i++)cin>>v2[i]>>w2[i]>>cnt2[i];
    int io[n],w[n],v[n],cnt[n];iota(io,io+n,0);
    sort(io,io+n,[&](const int &x,const int &y){return v2[x]>v2[y];});
    for(int i=0;i<n;i++){
        w[i]=w2[io[i]];
        v[i]=v2[io[i]];
        cnt[i]=cnt2[io[i]];
    }
    vector<int>dp(k+1,0);
    for(int i=0;i<n;i++){
        vector<int>dp2(k+1,0);
        for(int j=0;j<=k;j++){
            dp2[j]=max(dp2[j],dp[j]);
            dp2[j+(min(cnt[i],((k-j)/w[i]))*w[i])]=max(dp2[j+(min(cnt[i],((k-j)/w[i]))*w[i])],dp[j]+(min(cnt[i],(k-j)/w[i])*v[i]));
        }
        swap(dp2,dp);
    }
    int ans=0;
    for(int x:dp)ans=max(x,ans);
    cout<<ans;
}

int main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);
    bool usaco=0;if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
    int t=1;
    if(!t)cin>>t;
    while(t--){code();cout<<endl;}
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:39:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |     bool usaco=0;if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
      |                            ~~~~~~~^~~~~~~~~~~~~~~~~
knapsack.cpp:39:60: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |     bool usaco=0;if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
      |                                                     ~~~~~~~^~~~~~~~~~~~~~~~~~~

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