제출 #564866

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
564866		aryan12	Dostavljač (COCI18_dostavljac)	C++17	140 / 140	288 ms	2412 KiB

dostavljac

#include <bits/stdc++.h>
using namespace std;

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

const int MAXN = 502;
int n, m;
vector<int> a(MAXN);
vector<int> g[MAXN];
int dp[MAXN][MAXN][2];

void dfs(int node, int par)
{
	for(int i = 1; i <= m; i++)
	{
		dp[node][i][1] = a[node];
		dp[node][i][0] = a[node];
	}
	for(int to: g[node])
	{
		if(to == par)
		{
			continue;
		}
		dfs(to, node);
		for(int tot_time = m; tot_time > 0; tot_time--)
		{
			for(int cur_time = tot_time; cur_time > 0; cur_time--)
			{
				if(tot_time - cur_time - 1 >= 0) dp[node][tot_time][0] = max(dp[node][tot_time][0], max(dp[to][cur_time][0], dp[to][cur_time][1]) + dp[node][tot_time - cur_time - 1][1]);
				if(tot_time - cur_time - 2 >= 0) dp[node][tot_time][0] = max(dp[node][tot_time][0], dp[to][cur_time][1] + dp[node][tot_time - cur_time - 2][0]);
				if(tot_time - cur_time - 2 >= 0) dp[node][tot_time][1] = max(dp[node][tot_time][1], dp[to][cur_time][1] + dp[node][tot_time - cur_time - 2][1]);
			}
		}
	}
}

void Solve() 
{
	cin >> n >> m;
	for(int i = 1; i <= n; i++)
	{
		cin >> a[i];
	}
	for(int i = 1; i < n; i++)
	{
		int u, v;
		cin >> u >> v;
		g[u].push_back(v);
		g[v].push_back(u);
	}
	if(n == 1)
	{
		cout << a[1] << "\n";
		return;
	}
	dfs(1, -1);
	cout << max(dp[1][m][1], dp[1][m][0]) << "\n";
}

int32_t main() 
{
	auto begin = std::chrono::high_resolution_clock::now();
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int t = 1;
	// cin >> t;
	for(int i = 1; i <= t; i++) 
	{
		//cout << "Case #" << i << ": ";
		Solve();
	}
	auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
	return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 14 / 14
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• Subtask 10: 14 / 14