Submission #292047

#	Time	Username	Problem	Language	Result	Execution time	Memory
292047		shivensinha4	Museum (CEOI17_museum)	C++17	100 / 100	368 ms	220808 KiB

museum

#include <bits/stdc++.h> 
using namespace std; 
#define for_(i, s, e) for (int i = s; i < (int) e; i++)
#define for__(i, s, e) for (ll i = s; i < e; i++)
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> ii;
#define endl '\n'

const int MXN = 10001;
int n, k;
vector<vector<pair<int, int>>> adj;
int dp[MXN][2][MXN];
int sub[MXN+1];
const int INF = 1e9;

void dfs(int p, int parent) {
	sub[p] = 1;
	dp[p][0][1] = dp[p][1][1] = 0;
	
	for (auto i: adj[p]) if (i.first != parent) {
		dfs(i.first, p);
		for_(j, 1, sub[i.first]+1) dp[p][0][sub[p]+j] = dp[p][1][sub[p]+j] = INF;
		for (int ct = sub[p]; ct >= 0; ct--) for (int t = sub[i.first]; t >= 1; t--) {
			dp[p][1][ct+t] = min(dp[p][1][ct+t], dp[p][1][ct] + dp[i.first][1][t] + 2*i.second);
			dp[p][0][ct+t] = min(dp[p][0][ct+t], dp[p][0][ct] + dp[i.first][1][t] + 2*i.second);
			dp[p][0][ct+t] = min(dp[p][0][ct+t], dp[p][1][ct] + dp[i.first][0][t] + i.second);
		}
		sub[p] += sub[i.first];
	}
}

int main() {
	#ifndef ONLINE_JUDGE
	//freopen("test.in", "r", stdin);
	#endif
	
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	
	int x; cin >> n >> k >> x;
	adj.resize(n);
	for_(i, 0, n-1) {
		int a, b, w; cin >> a >> b >> w;
		a -= 1; b -= 1; 
		adj[a].push_back({b, w});
		adj[b].push_back({a, w});
	}
	
	x -= 1;
	dfs(x, x);
	
	cout << dp[x][0][k] << endl;

	return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 25 / 25
• Subtask 3: 35 / 35
• Subtask 4: 20 / 20