Submission #830845

#	Time	Username	Problem	Language	Result	Execution time	Memory
830845		howard0027	Knapsack (NOI18_knapsack)	C++14	73 / 100	1091 ms	1300 KiB

knapsack

//knapsack.cpp
#include<cstdio>
#include<vector>
#include<algorithm>
#include<deque>
#include<utility>

int main()
{
	int s, n;
	std::vector<int> dp;
	scanf("%d%d", &s, &n);
	dp.resize(s + 1, 0);
	for (int i = 0; i < n; ++i)
	{
		int v, w, k;
		scanf("%d%d%d", &v, &w, &k);
		for (int r = 0; r < w; ++r)
		{
			std::deque<std::pair<int, int>> dq;
			
			for (int q = 0; w * q + r <= s; ++q)
			{
				
				while (dq.size() && dq.front().second < q - std::min(q, k))
				{
					dq.pop_front();
				}
				
				while (dq.size() && dq.back().first <= dp[w * q + r] - q * v)
				{
					dq.pop_back();
				}
				
				dq.push_back(std::make_pair(dp[w * q + r] - q * v, q));
				
				dp[w * q + r] = dq.front().first + q * v;
				//printf("dp[%d][%d] = %d\n", i, w * q + r, dp[w * q + r]);
			}
		}
	}
	printf("%d\n", dp[s]);
	return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:12:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  scanf("%d%d", &s, &n);
      |  ~~~~~^~~~~~~~~~~~~~~~
knapsack.cpp:17:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |   scanf("%d%d%d", &v, &w, &k);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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