제출 #412951

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
412951		MohamedAhmed04	Cat in a tree (BOI17_catinatree)	C++14	100 / 100	96 ms	24104 KiB

catinatree

#include <bits/stdc++.h>

using namespace std ;

const int MAX = 2e5 + 10 ;

int dep[MAX] ;
int n , d ;

vector< vector<int> >adj(MAX) ;

int ans = 0 ;

int dfs(int node)
{
	vector<int>v ;
	ans++ ;
	v.push_back(dep[node]) ;
	for(auto &child : adj[node])
	{
		dep[child] = dep[node] + 1 ;
		v.push_back(dfs(child)) ;
	}
	sort(v.begin() , v.end()) ;
	reverse(v.begin() , v.end()) ;
	while(v.size() >= 2 && v[v.size()-1] + v[v.size()-2] - 2*dep[node] < d)
		v.pop_back() , ans-- ;
	return v.back() ;
}

int main()
{
	ios_base::sync_with_stdio(0) ;
	cin.tie(0) ;
	cin>>n>>d ;
	for(int i = 2 ; i <= n ; ++i)
	{
		int p ; 
		cin>>p ;
		adj[p+1].push_back(i) ;
	}
	dfs(1) ;
	return cout<<ans<<"\n" , 0 ;
}		

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