Submission #1346114

#	Time	Username	Problem	Language	Result	Execution time	Memory
1346114		nguthianmangcay	Knapsack (NOI18_knapsack)	C++20	73 / 100	1096 ms	47784 KiB

knapsack

#include<bits/stdc++.h>
using namespace std;
const int N=2e5+3;
const int K=3e6+3;
const long long inf=1e18+3;
#define ll long long
#define fi first
#define se second
#define VOI void
#define int long long

int k[N],w[N],v[N];

ll nw[K],nv[K];

VOI jiangly(){
    int n,W;
    cin>>W>>n;
    int cnt=0;
    for(int i=1;i<=n;i++){
        cin>>v[i]>>w[i]>>k[i];
        int c=1;
        while(k[i] > c){
            k[i]-=c;
            nw[++cnt]=c*w[i];
            nv[cnt]=c*v[i];
            c*=2;
        }
        if(k[i] >= 1){
            nw[++cnt]=k[i]*w[i];
            nv[cnt]=k[i]*v[i];
        }
    }
    vector<ll>pre(W+2,0);
    vector<ll>cur(W+2,0);
    for(int i=1;i<=cnt;i++){
        for(int j=1;j<=W;j++){
            cur[j]=pre[j];
            if(j >= nw[i]){
                cur[j]=max(cur[j],pre[j-nw[i]]+nv[i]);
            }
        }
        swap(pre,cur);
    }
    cout<<pre[W];
}
int32_t main(){
    cin.tie(0)->sync_with_stdio(0);
    if(fopen("QUANSENSEI.inp","r")){
        freopen("O(0).inp","r",stdin);
    }
//    if(fopen("input.txt","r")){
//        freopen("input.txt","r",stdin);
//        freopen("output.txt","w",stdout);
//    }
    jiangly();
}

Compilation message (stderr)

knapsack.cpp: In function 'int32_t main()':
knapsack.cpp:50:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |         freopen("O(0).inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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