Submission #1090092

#	Time	Username	Problem	Language	Result	Execution time	Memory
1090092		Staheos	Knapsack (NOI18_knapsack)	C++14	100 / 100	202 ms	35724 KiB

knapsack

#include <iostream>
#include <vector>
#include <queue>

using namespace std;

int main()
{
	int n, s;
	cin >> s >> n;
	auto q = new priority_queue<pair<int, int>>[s + 1];
	for (int i = 0; i <= s; i++)
	{
		q[i] = priority_queue<pair<int, int>>();
	}
	for (int i = 0; i < n; i++)
	{
		int v, w, k;
		cin >> v >> w >> k;
		q[w].push(pair<int, int>(v, k));
	}

	auto e = new vector<long long>[s + 1];
	for (int i = 0; i <= s; i++)
	{
		e[i] = vector<long long>();
		while (!q[i].empty() && e[i].size() < s)
		{
			auto p = q[i].top();
			q[i].pop();
			e[i].push_back(p.first);
			p.second--;
			if (p.second > 0)
			{
				q[i].push(p);
			}
			
		}
	}
	delete[] q;

	/*for (int i = 0; i <= s; i++)
	{
		cout << "i: " << i << ' ';
		for (int j = 0; j < e[i].size(); j++)
		{
			cout << e[i][j] << ' ';
		}
		cout << '\n';
	}*/

	long long* dp = new long long[s + 1];
	for (int i = 1; i <= s; i++)
	{
		dp[i] = -1;
	}
	dp[0] = 0;
	
	int* h = new int[s + 1];
	long long* prev = new long long[s + 1];
	for (int i = 1; i <= s; i++)
	{
		if (e[i].size() < 1)
		{
			continue;
		}
		for (int j = s; j >= 0; j--)
		{
			if (dp[j] == -1)
			{
				continue;
			}
			for (int k = 0; k < e[i].size() && j + i * (k + 1) <= s; k++)
			{
				if (dp[j + i * (k + 1)] == -1)
				{
					dp[j + i * (k + 1)] = dp[j + i * k] + e[i][k];
				}
				else if (dp[j + i * (k + 1)] < dp[j + i * k] + e[i][k])
				{
					dp[j + i * (k + 1)] = dp[j + i * k] + e[i][k];
				}
			}
		}
	}

	int m = 0;
	for (int i = 0; i <= s; i++)
	{
		//cout << "dp " << i << ' ' << dp[i] << '\n';
		if (dp[i] > dp[m])
		{
			m = i;
		}
	}
	cout << dp[m];
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:27:39: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   27 |   while (!q[i].empty() && e[i].size() < s)
      |                           ~~~~~~~~~~~~^~~
knapsack.cpp:73:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |    for (int k = 0; k < e[i].size() && j + i * (k + 1) <= s; k++)
      |                    ~~^~~~~~~~~~~~~
knapsack.cpp:59:7: warning: unused variable 'h' [-Wunused-variable]
   59 |  int* h = new int[s + 1];
      |       ^
knapsack.cpp:60:13: warning: unused variable 'prev' [-Wunused-variable]
   60 |  long long* prev = new long long[s + 1];
      |             ^~~~

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