Submission #121692

#	Time	Username	Problem	Language	Result	Execution time	Memory
121692		sofhiasouza	Chase (CEOI17_chase)	C++14	30 / 100	663 ms	78920 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], soma[maxn];
 
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 < (int) grafo[u].size() ; i++)
	{
		int v = grafo[u][i];

		if(v == pai) continue;
 
		dp[u][val] = max({dp[u][val], dfs(v, val, u), dfs(v, val-1, u) + soma[v] - vet[u]});
	}
	return dp[u][val];
}

void roda(int u, int pai) {

}
 
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);
	}

	for(int i = 1; i <= n; i++) {
		for(auto v : grafo[i]) {
			soma[i] += vet[v];
		}
	}

	ll resp = max(dfs(1, v, 0), dfs(1, v-1, 0) + soma[1]);

	if(n <= 1000)
	{
		for(int i = 2 ; i <= n ; i++)
		{
			for(int j = 0 ; j <= n ; j++)
				for(int k = 0 ; k <= v ; k++) dp[j][k] = 0;
					
			resp = max({resp, dfs(i, v, 0), dfs(i, v-1, 0) + soma[i]});
		}
	}
 
	cout << resp << endl;
}

Compilation message (stderr)

chase.cpp: In function 'll dfs(int, int, int)':
chase.cpp:18:5: warning: unused variable 'resp1' [-Wunused-variable]
  ll resp1 = 0, resp2 = 0, cont = 0;
     ^~~~~
chase.cpp:18:16: warning: unused variable 'resp2' [-Wunused-variable]
  ll resp1 = 0, resp2 = 0, cont = 0;
                ^~~~~
chase.cpp:18:27: warning: unused variable 'cont' [-Wunused-variable]
  ll resp1 = 0, resp2 = 0, cont = 0;
                           ^~~~

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