Submission #759825

#	Time	Username	Problem	Language	Result	Execution time	Memory
759825		sofija6	Knapsack (NOI18_knapsack)	C++14	73 / 100	317 ms	262144 KiB

knapsack

#include <bits/stdc++.h>
#define ll long long
#define MAXN 100010
#define MAXS 2010
using namespace std;
vector<pair<ll,ll> > val[MAXS];
vector<ll> cnt[MAXN];
ll dp[MAXS],v[MAXN],w[MAXN],k[MAXN];
int main()
{
    ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    ll s,n,ans=0;
    cin >> s >> n;
    for (ll i=1;i<=n;i++)
    {
        cin >> v[i] >> w[i] >> k[i];
        for (ll j=1;j<=k[i] && j*w[i]<=s;j++)
            val[j*w[i]].push_back({j*v[i],i});
    }
    for (ll i=1;i<=s;i++)
    {
        sort(val[i].begin(),val[i].end(),greater<pair<ll,ll> >());
        for (ll j=0;j<val[i].size() && (j+1)*i<=s;j++)
            cnt[val[i][j].second].push_back(i/w[val[i][j].second]);
    }
    for (ll i=1;i<=n;i++)
    {
        for (ll j=s;j>=0;j--)
        {
           for (ll l : cnt[i])
           {
               if (j+l*w[i]>s)
                   break;
               dp[j+l*w[i]]=max(dp[j+l*w[i]],dp[j]+l*v[i]);
           }
        }
    }
    for (ll i=0;i<=s;i++)
        ans=max(ans,dp[i]);
    cout << ans;
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:23:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         for (ll j=0;j<val[i].size() && (j+1)*i<=s;j++)
      |                     ~^~~~~~~~~~~~~~

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