Submission #730617

#	Time	Username	Problem	Language	Result	Execution time	Memory
730617		PVSekhar	Knapsack (NOI18_knapsack)	C++14	0 / 100	3 ms	468 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
#define ll long long
const ll MOD = 1000000007;
 
 
int main()
{
    #ifndef ONLINE_JUDGE
        freopen("input.in","r",stdin);
        freopen("output.out","w",stdout);
    #endif
    ll n,s;
    cin>>s>>n;
    vector<ll> dp(s+1,0);
    vector<vector<pair<ll,ll>>> store(s+1);
    ll v,w,k;
    for (ll i = 0; i < n; i++)
    {
        cin>>v>>w>>k;
        store[w].push_back({v,k});
    }
    for (auto st:store)
    {
        sort(st.begin(),st.end());
        reverse(st.begin(),st.end());
    }
    vector<pair<int,int>> final_store;
    ll ind=0,x=0;
    for (ll i = 1; i <= s; i++)
    {
        ind=0;
        if(store[i].size()==0)continue;
        for (ll j = 1; j <= (s/i); j++)
        {
            if(ind >= store[i].size()) break;
            final_store.push_back({i,store[i][ind].first});
            if(! --store[i][ind].second) ind++;
        }
    }
    for(auto i : final_store){
        for(int j = s; j >= i.first; j--) dp[j] = max(dp[j],dp[j-i.first]+i.second);
    }
    cout<<dp[s]<<endl;
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:36:20: 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]
   36 |             if(ind >= store[i].size()) break;
      |                ~~~~^~~~~~~~~~~~~~~~~~
knapsack.cpp:29:14: warning: unused variable 'x' [-Wunused-variable]
   29 |     ll ind=0,x=0;
      |              ^
knapsack.cpp:10:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |         freopen("input.in","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:11:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |         freopen("output.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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