Submission #1129583

#	Time	Username	Problem	Language	Result	Execution time	Memory
1129583		Muhammet	Cat in a tree (BOI17_catinatree)	C++20	51 / 100	1096 ms	15544 KiB

catinatree

#include "bits/stdc++.h"

using namespace std;

#define SZ(s) (int)s.size()
#define ss second

int n, d, mn, cnt;

vector <int> h, p, vis, v1;

vector <vector <int>> v, dp, sp;

void dfs(int x, int y){
	p[x] = y;
	for(auto i : v[x]){
		if(i == y) continue;
		h[i] = h[x]+1;
		dfs(i,x);
	}
}

void f(int x, int y, int dis){
	if(vis[x]) mn = min(mn, dis);
	for(auto i : v[x]){
		if(i == y) continue;
		f(i,x,dis+1);
	}
}

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

	cin >> n >> d;
	v.resize(n), h.assign(n, 0), p.assign(n+1, n+1), vis.assign(n,0);
	for(int i = 1; i < n; i++){
		int x;
		cin >> x;
		v[i].push_back(x);
		v[x].push_back(i);
	}
	dfs(0,0);
	vector <pair<int,int>> v1;
	for(int i = 0; i < n; i++){
		v1.push_back({h[i],i});
	}
	sort(v1.rbegin(), v1.rend());
	int ans = 0;
	for(int i = 0; i < n; i++){
		int x = v1[i].ss;
		mn = 1e9;
		f(x,x,0);
		if(mn < d) continue;
		vis[x] = true;
		ans++;
	}
	cout << ans;
	return 0;
}

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