Submission #875694

#	Time	Username	Problem	Language	Result	Execution time	Memory
875694		tinnhiemnn	Knapsack (NOI18_knapsack)	C++14	0 / 100	6 ms	31836 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
#define file "file"
#define pll pair<long long, long long>
const long long N=2005, INF=1e12;
long long W,n,i,j,k,v,w,sum,t,dem,dp[N][N],res;
vector<pll> a[N];

int main()
{
    //freopen(file".inp", "r", stdin);
    //freopen(file".out", "w", stdout);
    ios_base::sync_with_stdio(); cin.tie();

    cin>>W>>n;
    for (i=1;i<=n;i++)
    {
        cin>>v>>w>>k;

        if (w<W && k>0) a[w].push_back({v, min(k, W/w)});
    }

    memset(dp, -0x3f, sizeof dp);
    dp[0][0]=0;

    for (i=1;i<=W;i++)
    {
        if (a[i].size()>0) sort(a[i].begin(), a[i].end(), greater<pll>());

        for (j=0;j<=W;j++)
        {
            dp[i][j]=dp[i-1][j];
            if (a[i].size()==0) continue;

            sum=0; t=0; k=0; dem=0;

            while ((sum+1)*i <= j && k<a[i].size())
            {
                sum++;
                t+=a[i][k].first; dem++; //cout<<i<<' '<<j<<' '<<k<<' '<<dem<<'\n';

                if (dp[i-1][j-sum*i] > -INF) dp[i][j]=max(dp[i][j], dp[i-1][j-sum*i] + t);

                if (dem==a[i][k].second) k++, dem=0;
            }
            res=max(res, dp[i][j]);
        }
    }

    cout<<res;





}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:37:39: 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]
   37 |             while ((sum+1)*i <= j && k<a[i].size())
      |                                      ~^~~~~~~~~~~~

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