Submission #438691

#	Time	Username	Problem	Language	Result	Execution time	Memory
438691		Haidara	Knapsack (NOI18_knapsack)	C++17	100 / 100	160 ms	3812 KiB

knapsack

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int S, N, V, W, K;
vector <pair<int, int>> A[2001];
long long dp[2001], answer;
int main()
{
	cin >> S >> N;
	for(int i = 0; i < N; i++)
	{
		cin >> V >> W >> K;
		A[W].push_back(make_pair(V, K));
	}
	for(int i = 1; i <= S; i++)
	{
		sort(A[i].begin(), A[i].end(), greater<pair<int, int>>());
		int index=0;
		// i is the wieght
		for(int j=0;j<S/i&&index<A[i].size();j++)
		{
			// j is capacity of knapsack from i wieght
			for(int k = S; k >= i; k--)
			{
				dp[k] = max(dp[k], dp[k - i] + A[i][index].first);
				answer = max(answer, dp[k]);
			}
			A[i][index].second--;
			if(A[i][index].second == 0) index++;
		}
	}
	cout << answer << endl;
	return 0;
} 

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:21:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |   for(int j=0;j<S/i&&index<A[i].size();j++)
      |                      ~~~~~^~~~~~~~~~~~

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