Submission #613568

#	Time	Username	Problem	Language	Result	Execution time	Memory
613568		anirudh001	Knapsack (NOI18_knapsack)	C++14	0 / 100	1 ms	212 KiB

knapsack

#include <bits/stdc++.h>
#define ll long long
using namespace std;
const ll N = 1e6;

int main()
{
    #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    #endif
    
    ll s, n;
    cin >> s >> n;
    map<ll, vector<pair<ll, ll>>> mp;
    for(int i = 0; i<n; i++){
        ll v, w, k;
        cin >> v >> w >> k;

        if(w<=s && k>0){
            mp[w].push_back({v, k});
        }
    }
    ll m = mp.size();
    ll ans = 0;
    vector<vector<ll>> dp(m+1, vector<ll>(s+1,  LONG_LONG_MIN));
    dp[0][0] = 0;
    ll i = 1;
    for(auto x: mp){
        auto items = x.second; 
        auto w = x.first;  
        sort(items.begin(), items.end(), greater<pair<ll, ll>>());
        
        for(int j=0; j<=s; j++){
            dp[i][j] = dp[i-1][j];
            ll copies = 0, k = 0, cur = 0, profit = 0;
            while((copies+1)*w<=j && k<items.size()){
                copies++;
                profit+=items[k].first;
                if(dp[i-1][j-copies*w]!=LONG_LONG_MIN){
                    dp[i][j] = max(dp[i][j], dp[i-1][j-copies*w] + profit);
                }
                cur++;
                if(cur==items[k].second){
                    cur = 0;
                    k++;
                }
            }
            ans = max(dp[i][j],ans);
        }
        
        i++;
    }

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

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((copies+1)*w<=j && k<items.size()){
      |                                      ~^~~~~~~~~~~~~
knapsack.cpp:9:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:10:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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