Submission #914013

#	Time	Username	Problem	Language	Result	Execution time	Memory
914013		dpsaveslives	Knapsack (NOI18_knapsack)	C++17	100 / 100	45 ms	2080 KiB

knapsack

#include <bits/stdc++.h>
#define f first
#define s second
using namespace std;
const int MAX = 2010;
int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int S,N; cin >> S >> N;
    vector<pair<int,int>> mp[MAX];
    for(int i = 0;i<N;++i){
        int v,w,k; cin >> v >> w >> k;
        mp[w].push_back({v,min(k,S/w)});
    }
    vector<int> dp(S+1,0);
    for(int i = 1;i<=S;++i){
        vector<pair<int,int>> vec = mp[i];
        sort(vec.rbegin(),vec.rend());
        int cnt = 0;
        for(int j = 0;j<vec.size();++j){
            int v = vec[j].f, k = vec[j].s;
            while(k--){
                for(int l = S;l>=i;l--){
                    dp[l] = max(dp[l],dp[l-i]+v);
                }
                ++cnt;
                if(cnt*i >= S) break;
            }
            if(cnt*i >= S) break;
        }
    }
    cout << dp[S] << "\n";
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:20:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |         for(int j = 0;j<vec.size();++j){
      |                       ~^~~~~~~~~~~

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