Submission #917463

#	Time	Username	Problem	Language	Result	Execution time	Memory
917463		PieArmy	Knapsack (NOI18_knapsack)	C++17	37 / 100	12 ms	664 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 v[n],w[n],cnt[n];
    for(int i=0;i<n;i++)cin>>v[i]>>w[i]>>cnt[i];
    vector<int>dp(k+1,0);
    for(int i=0;i<n;i++){
        vector<int>dp2(k+1,0);
        vector<multiset<int>>st(k+1,multiset<int>());
        for(int j=0;j<=k;j++){
            st[j].insert(((k/w[i])-(j/w[i]))*v[i]+dp[j]);
            dp2[j]=(*(--st[j].end()))-(((k/w[i])-(j/w[i]))*v[i]);
            if(j>=w[i]*cnt[i]){
                st[j].erase(st[j].find(((k/w[i])-((j-(w[i]*cnt[i]))/w[i]))*v[i]+dp[j-(w[i]*cnt[i])]));
            }
            if(j+w[i]<=k)swap(st[j],st[j+w[i]]);
        }
        swap(dp,dp2);
    }
    int ans=0;
    for(int i=0;i<=k;i++)ans=max(ans,dp[i]);
    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:37:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     bool usaco=0;if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
      |                            ~~~~~~~^~~~~~~~~~~~~~~~~
knapsack.cpp:37:60: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     bool usaco=0;if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
      |                                                     ~~~~~~~^~~~~~~~~~~~~~~~~~~

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