제출 #481323

#제출 시각아이디문제언어결과실행 시간메모리
481323DJeniUpCat in a tree (BOI17_catinatree)C++17
51 / 100
92 ms23996 KiB
//#pragma GCC Optimize("O3") #include <bits/stdc++.h> using namespace std; typedef long long ll; typedef unsigned long long ull; typedef pair<ll,ll>pairll; typedef pair<ll,pairll>pairlll; typedef pair<pairll,pairll>pairllll; typedef long double ld; typedef pair<ll,string>pairls; #define INF 1000000000000007 #define MOD 1000000007 #define pb push_back #define fr first #define sc second #define endl '\n' ll n,m,t[1507][1507],res; vector<ll>v[1507]; void S(ll x,ll y){ for(int i=0;i<int(v[x].size());i++){ if(v[x][i]!=y)S(v[x][i],x); } for(int i=m-1;i>=1;i--){ if(i*2<m){ t[x][i]=0; ll h=0; for(int j=0;j<int(v[x].size());j++){ if(v[x][j]!=y)h+=t[v[x][j]][m-i-1]; } for(int j=0;j<int(v[x].size());j++){ if(v[x][j]!=y){ t[x][i]=max(t[x][i],h-t[v[x][j]][m-i-1]+t[v[x][j]][i-1]); } } }else{ t[x][i]=0; for(int j=0;j<int(v[x].size());j++){ if(v[x][j]!=y)t[x][i]+=t[v[x][j]][i-1]; } } t[x][i]=max(t[x][i],t[x][i+1]); } t[x][0]=1; for(int i=0;i<int(v[x].size());i++){ if(v[x][i]!=y)t[x][0]+=t[v[x][i]][m-1]; } t[x][0]=max(t[x][0],t[x][1]); return ; } int main() { cin>>n>>m; m=min(n,m); for(int i=1;i<n;i++){ ll l; cin>>l; v[l].pb(i); v[i].pb(l); } S(0,0); res=0; for(int i=0;i<m;i++){ res=max(res,t[0][i]); } cout<<res<<endl; }
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