Submission #1165463

#	Time	Username	Problem	Language	Result	Execution time	Memory
1165463		enzy	Knapsack (NOI18_knapsack)	C++20	12 / 100	0 ms	328 KiB

knapsack

#include <bits/stdc++.h>
#define int long long
using namespace std;
const int maxs=2e3+10;
const int maxn=1e5+10;
const int inf=1e18+10;
int dp[maxs], v[maxn], w[maxn], k[maxn];
bool cmp(pair<int,pair<int,int>> a, pair<int,pair<int,int>> b){
    if(a.second.first*b.second.second>a.second.second*b.second.first) return true;
    return false;
}
signed main()
{
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    int s, n; cin >> s >> n;
    vector<pair<int,int>>process;
    vector<pair<int,pair<int,int>>>order;
    for(int i=1;i<=n;i++){
        cin >> v[i] >> w[i] >> k[i];
        order.push_back({i,{v[i],w[i]}});
        //for(int q=1;q<=min(k[i],(s/w[i]));q++) process.push_back({w[i],v[i]});
    }
    sort(order.begin(),order.end(),cmp); reverse(order.begin(),order.end());
    int at=s;
    for(auto p : order){
        int i=p.first;
        for(int q=1;q<=min(k[i],(at/w[i]));q++) process.push_back({w[i],v[i]});
        if(k[i]*w[i]>=at) at%=w[i];
        else at-=k[i]*w[i];
    }
    for(int i=0;i<process.size();i++){
        pair<int,int>p=process[i];
        for(int j=s;j>=0;j--){
            if(p.first<=j) dp[j]=max(dp[j],dp[j-p.first]+p.second);
        }
    }
    int resp=0;
    for(int i=0;i<=s;i++) resp=max(resp,dp[i]);
    cout << resp << endl;
    return 0;
}

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