Submission #917438

#	Time	Username	Problem	Language	Result	Execution time	Memory
917438		PieArmy	Knapsack (NOI18_knapsack)	C++17	29 / 100	1 ms	500 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);
    vector<pair<int,int>>ek(k+1,make_pair(-1,0));
    for(int i=0;i<n;i++){
        vector<int>dp2(k+1,0);
        vector<pair<int,int>>ek2(k+1,make_pair(-1,0));
        for(int j=0;j<=k;j++){
            dp2[j]=max(dp2[j],max(dp[j],ek[j].fr));
            if(j+w[i]<=k){
                if(dp[j]>=ek[j].fr){
                    ek[j+w[i]]={dp[j]+v[i],cnt[i]-1};
                }
                else{
                    if(ek[j].sc){
                        ek[j+w[i]]={ek[j].fr+v[i],ek[j].sc-1};
                    }
                    if(j+(ek[j].sc*w[i])+w[i]<=k){
                        ek[j+(ek[j].sc*w[i])+w[i]]={dp[j]+(ek[j].sc*v[i])+v[i],cnt[i]-ek[j].sc-1};
                    }
                }
            }
        }
        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:46:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |     bool usaco=0;if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
      |                            ~~~~~~~^~~~~~~~~~~~~~~~~
knapsack.cpp:46:60: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |     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