제출 #964050

#제출 시각아이디문제언어결과실행 시간메모리
964050ezzzayCat in a tree (BOI17_catinatree)C++14
100 / 100
93 ms24764 KiB
#include<bits/stdc++.h> using namespace std; #define int long long #define ff first #define ss second #define pb push_back const int N=2e5+5; vector<int>v[N]; int dp[N]; int dst[N]; bool vis[N]; int n,d; void dfs(int a){ vis[a]=1; int mx=1e9,cnt=0; for(auto b:v[a]){ if(vis[b])continue; dfs(b); if(mx+dst[b]>=d){ cnt+=dp[b]; mx=min(mx,dst[b]); } else{ cnt+=dp[b]-1; mx=max(mx,dst[b]); } } if(mx>=d){ dst[a]=1; dp[a]=cnt+1; } else{ dst[a]=mx+1; dp[a]=cnt; } } signed main(){ cin>>n>>d; for(int i=1;i<n;i++){ int a; cin>>a; v[a].pb(i); v[i].pb(a); } dfs(0); cout<<dp[0]; }
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