제출 #986736

#제출 시각아이디문제언어결과실행 시간메모리
986736Jawad_Akbar_JJCat in a tree (BOI17_catinatree)C++17
0 / 100
0 ms344 KiB
#include <iostream> #include <vector> using namespace std; const int N = 1501; vector<int> nei[N]; int dp[N][N], D; void dfs(int u){ dp[u][0] = 1; for (int i : nei[u]){ dfs(i); dp[i][D-1] = max(dp[i][D-1],dp[i][D]); int mx = 0; for (int d = 1;d<=D;d++){ mx = max(mx,dp[u][D - d]); int k = min(d,D - d); dp[u][k] = max(dp[u][k],dp[i][d-1] + mx); } } } int main(){ int n; cin>>n>>D; for (int i=2;i<=n;i++){ int p; cin>>p; nei[p + 1].push_back(i); } dfs(1); int ans = 0; for (int i=0;i<=n;i++) ans = max(ans,dp[1][i]); cout<<ans<<'\n'; } // next
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