Submission #121583

#	Time	Username	Problem	Language	Result	Execution time	Memory
121583		sofhiasouza	Chase (CEOI17_chase)	C++14	50 / 100	4018 ms	98984 KiB

chase

#include <bits/stdc++.h>
#define pb push_back
using namespace std;
typedef long long int ll;

const int maxn = 1e5+10;

int n, v, vet[maxn];
ll dp[maxn][110];

vector < int > grafo[maxn];

ll dfs(int u, int val, int pai)
{
	if(val == 0) return 0;
	if(dp[u][val]) return dp[u][val];

	ll resp1 = 0, resp2 = 0, cont = 0;
	for(int i = 0 ; i < grafo[u].size() ; i++)
	{
		int v = grafo[u][i];
		if(v == pai) continue;

		cont += vet[v];
		resp1 = max(resp1, dfs(v, val-1, u));
		resp2 = max(resp2, dfs(v, val, u));
	}

	resp1 += cont;

	return dp[u][val] = max(resp1, resp2);
}

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);

	cin >> n >> v;
	
	for(int i = 1 ; i <= n ; i++) cin >> vet[i];

	for(int i = 0 ; i < n-1 ; i++)
	{
		int a, b;
		cin >> a >> b;
		grafo[a].pb(b);
		grafo[b].pb(a);
	}

	ll resp = dfs(1, v, 0);

	if(n <= 1000)
	{
		for(int i = 2 ; i <= n ; i++)
		{
			memset(dp, 0, sizeof dp);
			resp = max(resp, dfs(i, v, 0));
		}
	}

	cout << resp << endl;
}

Compilation message (stderr)

chase.cpp: In function 'll dfs(int, int, int)':
chase.cpp:19:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0 ; i < grafo[u].size() ; i++)
                  ~~^~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 0 / 20
• Subtask 3: 30 / 30
• Subtask 4: 0 / 30