Submission #680434

#	Time	Username	Problem	Language	Result	Execution time	Memory
680434		sz1218	Knapsack (NOI18_knapsack)	C++14	100 / 100	159 ms	35180 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pi;
typedef vector<int> vi;

const int NN = 1e6+3;
int n, S;
ll dp[2003][2003];

int main()
{
    //setIO("");
    cin >> S >> n;
    int V, W, K;
    map<int, vector<pi>> by_weight;
    for(int j=0;j<n;j++){
        cin >> V >> W >> K;
        by_weight[W].push_back({V, K});
    }
    int a = 1;
    for(auto&[w, item] : by_weight){
        sort(item.rbegin(), item.rend());
        for(int i=0;i<=S;i++){
            dp[a][i] = dp[a-1][i];
            int ta = 0;
            int copies = 0;
            int cur_used = 0;
            ll profit = 0;
            while((copies+1) * w <= i && ta < item.size()){
                copies++;
                profit += item[ta].first;
                dp[a][i] = max(dp[a][i], dp[a-1][i-copies*w] + profit);
                cur_used++;
                if(cur_used == item[ta].second){
                    cur_used = 0;
                    ta++;
                }
            }
        }
        a++;
    }
    ll ans = 0;

    for(int i=1;i<=S;i++){
        ans = max(ans, dp[a-1][i]);
    }
    cout << ans << endl;


    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:22:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   22 |     for(auto&[w, item] : by_weight){
      |              ^
knapsack.cpp:30:45: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |             while((copies+1) * w <= i && ta < item.size()){
      |                                          ~~~^~~~~~~~~~~~~

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