Submission #904135

#	Time	Username	Problem	Language	Result	Execution time	Memory
904135		SalihSahin	Knapsack (NOI18_knapsack)	C++14	0 / 100	1 ms	348 KiB

knapsack

#include<bits/stdc++.h>
#define int long long
#define pb push_back
#define mp make_pair
using namespace std;
 
const int mod = 1e9 + 7;
const int inf = 1e17*2;
const int N = 2e5 + 5;
 
int32_t main(){
    cin.tie(0); cout.tie(0);
    ios_base::sync_with_stdio(false);
    int s, n;
    cin>>s>>n;
    vector<int> items[s+1];
    for(int i = 0; i < n; i++){
        int v, w, k;
        cin>>v>>w>>k;
        k = min(k, 2047LL);
        for(int j = 0; j <= 10; j++){
            if(w * (1 << j) > s) continue;
            if(k >= (1 << j)){
                k -= (1 << j);
                items[w * (1 << j)].pb(v * (1 << j));
            }
        }
        for(int j = 0; j <= 10; j++){
            if(w * (1 << j) > s) continue;
            if(k >= (1 << j)){
                k -= (1 << j);
                items[w * (1 << j)].pb(v * (1 << j));
            }
        }
    }

    vector<pair<int, int> > arr;
    for(int i = 1; i <= s; i++){
        sort(items[i].begin(), items[i].end());
        while(items[i].size() * i > s){
            items[i].pop_back();
        }
        for(auto it: items[i]) arr.pb(mp(i, it));
    }

    vector<int> dp(s+1);
    for(int i = 0; i < arr.size(); i++){
        for(int j = s - arr[i].first; j >= 0; j--){
            dp[j + arr[i].first] = max(dp[j + arr[i].first], dp[j] + arr[i].second);
        }
    }  
    int ans = 0;
    for(int i = 0; i <= s; i++){
        ans = max(ans, dp[i]);
    }

    cout<<ans<<endl;
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int32_t main()':
knapsack.cpp:40:35: warning: comparison of integer expressions of different signedness: 'long long unsigned int' and 'long long int' [-Wsign-compare]
   40 |         while(items[i].size() * i > s){
      |               ~~~~~~~~~~~~~~~~~~~~^~~
knapsack.cpp:47:22: 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]
   47 |     for(int i = 0; i < arr.size(); i++){
      |                    ~~^~~~~~~~~~~~

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