Submission #1043749

#	Time	Username	Problem	Language	Result	Execution time	Memory
1043749		vjudge1	Knapsack (NOI18_knapsack)	C++17	100 / 100	40 ms	7920 KiB

knapsack

#include<bits/stdc++.h>
#define int long long
using namespace std;
using ll = long long;
const ll maxN=2e5;
ll s,n,v[maxN],w[maxN],k[maxN];
priority_queue<pair<int,int>>pq[2006];
#define fi first
#define se second
#define pb push_back
ll dp[2006];
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> s >> n;
    for(int i=1;i<=n;i++)
    {
        cin  >> v[i] >> w[i] >> k[i];
        pq[w[i]].push({v[i],k[i]});
    }
    vector<pair<int,int>> vec;
    for(int i=1;i<=s;i++)
    {
        ll need=s/i;
        while(pq[i].size()>0)
        {
            ll x=min(pq[i].top().se,need);
            need-=x;
            for(int j=1;j<=x;j++) vec.pb({i,pq[i].top().fi});
            auto tp=pq[i].top();
            pq[i].pop();
            tp.se-=x;
            if(tp.se>0) pq[i].push(tp);
            if(need==0) break;
        }
    }
    for(int i=0;i<vec.size();i++)
    {
        for(int j=s;j>=vec[i].fi;j--) dp[j]=max(dp[j],dp[j-vec[i].fi]+vec[i].se);
    }
    ll ans=0;
    for(int j=0;j<=s;j++) ans=max(ans,dp[j]);
    cout << ans;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:38:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int>, std::allocator<std::pair<long long int, long long int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |     for(int i=0;i<vec.size();i++)
      |                 ~^~~~~~~~~~~

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