Submission #456493

#	Time	Username	Problem	Language	Result	Execution time	Memory
456493		Hamed5001	Cat in a tree (BOI17_catinatree)	C++14	0 / 100	4 ms	5708 KiB

catinatree

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
const int mxN = 2e5+10;
vector<int> adj[mxN];
int cnt[mxN];
int N, D;

int bfs(int st) {
	memset(cnt, 0, sizeof cnt);
	vector<bool> vis(N+10, 0);
	queue<pair<int,int>> q;
	q.push({0, st});
	vis[st] = 1;

	while(q.size()) {
		auto node = q.front();
		q.pop();
		cnt[node.first]++;
		for (auto it : adj[node.second]) {
			if (!vis[it]) {
				vis[it] = 1;
				q.push({node.first+1, it});
			}
		}
	}
	int ret = 0;
	for (int i = 0; i <= N; i+=D)
		ret += cnt[i];
	return ret;
}

void solve() {
	cin >> N >> D;
	for (int i = 1; i < N; i++) {
		int v;
		cin >> v;
		adj[i].push_back(v);
		adj[v].push_back(i);
	}

	int ans = 0;
	for (int i = 0; i < N; i++) {
		ans = max(ans, bfs(i));
	}

	cout << ans << endl;
}

int main() {

	ios_base::sync_with_stdio(false);
	cin.tie(0);
	solve();
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 40
• Subtask 3: 0 / 49