提交时间:2025-06-27 13:50:47

运行 ID: 38198

#include<bits/stdc++.h> using namespace std; const int N=2e5+10,mod=1e9+9; vector<int> E[N]; int f[N],g[N],h[N],par[N],rng[N],siz[N],du[N]; int n; mt19937_64 rd(9517); int qp(int a,int b){ int x=1; while(b){ if(b&1) x=1ll*x*a%mod; a=1ll*a*a%mod;b>>=1; }return x; } unsigned int mask=rd(); int TR(unsigned int x) { x ^= mask; x ^= x << 13; x ^= x >> 7; x ^= x << 17; x ^= mask; return x%mod; } int SF=rd()%mod; int F(int x,int sz){ return (7ll*x%mod*x+2ll*(mod-x)+1ll*(1ll*TR(sz)+qp(131,TR(sz))+rng[sz]))%mod; } void dfs(int u,int fa){ siz[u]=1;f[u]=1;par[u]=fa; for(auto v:E[u]){ if(v==fa) continue; dfs(v,u); siz[u]+=siz[v]; f[u]=(f[u]+F(f[v],siz[v]))%mod; }f[u]=(f[u]+SF)%mod; }//get tree hash void dfs2(int u,int fa){ if(u!=1) h[u]=(f[u]+F(g[u],n-siz[u]))%mod; else h[u]=f[u]; for(auto v:E[u]){ if(v==fa) continue; g[v]=(h[u]-F(f[v],siz[v])+mod)%mod; dfs2(v,u); }h[u]=(h[u]+SF)%mod; } int main(){ cin>>n; for(int i=1;i<=n;i++) rng[i]=rd()%mod; for(int i=1;i<n;i++){ int u,v;cin>>u>>v; E[u].push_back(v); E[v].push_back(u); du[u]++;du[v]++; }dfs(1,0);dfs2(1,0); map<int,int> mp1; map<pair<int,int>,int> mp2; for(int i=1;i<=n;i++){ if(du[i]<4) mp1[h[i]]=1; if(!par[i]) continue; mp2[make_pair(f[i],g[i])]=1; mp2[make_pair(g[i],f[i])]=1; }cout<<mp1.size()<<' '<<mp1.size()+mp2.size()<<endl; return 0; }