Submission #694621

#	Time	Username	Problem	Language	Result	Execution time	Memory
694621		vjudge1	Knapsack (NOI18_knapsack)	C++17	100 / 100	55 ms	7204 KiB

knapsack

#include <bits/stdc++.h>
#define int long long
using namespace std;
const int maxn = 1e5 + 10;
typedef pair<int,int> ii;
#define ff first
#define ss second
int n,S;
int dp[maxn];
vector <ii> adj[maxn];
bool cmp(ii x, ii y)
{
    return x>y;
}
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    cin>>S>>n;
    for (int i=1; i<=n; i++)
    {
        int v,w,k; cin>>v>>w>>k;
        adj[w].push_back({v,k});
    }
    for (int i=1; i<=S; i++)
    {
        if (adj[i].empty()) continue;
        sort(adj[i].begin(),adj[i].end(),greater<ii>());
        for (int j=S; j>=i; j--)
        {
            int it=0;
            int sum=0; int cnt=adj[i][it].ss;
            int j2=j;
            while (cnt>0&&j2-i>=0)
            {
                sum+=adj[i][it].ff;
                cnt--;
                j2-=i;
                dp[j]=max(dp[j],dp[j2] + sum);
                if (cnt==0)
                {
                    it++;
                    if (it==adj[i].size()) break;
                    cnt=adj[i][it].ss;
                }
            }
        }
    }
    cout<<dp[S]<<'\n';
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:43:27: 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]
   43 |                     if (it==adj[i].size()) break;
      |                         ~~^~~~~~~~~~~~~~~

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