Language: C++

#pragma GCC optimize("O3")
#include<bits/stdc++.h> 
using namespace std;
using ll=long long;
using P=pair<ll,ll>;
template<class T> using V=vector<T>; 
#define fi first
#define se second
#define all(v) (v).begin(),(v).end()
const ll inf=(1e18);
//const ll mod=998244353;
constxper ll mod=1000000007;
ll gcd(ll a,ll b) {return b ? gcd(b,a%b):a;}
ll lcm(ll c,ll d){return c/gcd(c,d)*d;}
struct __INIT{__INIT(){cin.tie(0);ios::sync_with_stdio(false);cout<<fixed<<setprecision(15);}} __init;
template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }
struct mint{
    using ull=unsigned long long int;
    ull v;
    mint(ll vv=0){s(vv%mod+mod);}
    mint& s(ull vv){
        v=vv<mod?vv:vv-mod;
        return *this;
    }
    //オーバーロード
    mint operator-()const{return mint()-*this;}//符号反転
    mint&operator+=(const mint&val){return s(v+val.v);}
    mint&operator-=(const mint&val){return s(v+mod-val.v);}
    mint&operator*=(const mint&val){
        v=ull(v)*val.v%mod;
        return *this;
    }
    mint&operator/=(const mint&val){return *this*=val.inv();}
    mint operator+(const mint&val){return mint(*this)+=val;}
    mint operator-(const mint&val){return mint(*this)-=val;}
    mint operator*(const mint&val){return mint(*this)*=val;}
    mint operator/(const mint&val){return mint(*this)/=val;}
    mint pow(ll n)const{
        mint res(1),x(*this);
        while(n){
            if(n&1)res*=x;
            x*=x;
            n>>=1;
        }
        return res;
    }
     mint inv()const{return pow(mod-2);}
    //拡張ユークリッドの互除法
    /* mint inv()const{
        int x,y;
        int g=extgcd(v,mod,x,y);
        assert(g==1);
        if(x<0)x+=mod;
        return mint(x);
    }*/
    friend ostream& operator<<(ostream&os,const mint&val){
        return os<<val.v;
    }//出力
    bool operator<(const mint&val)const{return v<val.v;}
    bool operator==(const mint&val)const{return v==val.v;}
    bool operator>(const mint&val)const{return v>val.v;}
};
const ll MAX = 2000010;//設定
mint fac[MAX], finv[MAX], inv[MAX];
// テーブルを作る前処理
void init(){
    fac[0] = fac[1] = 1;
    for(int i=1;i<MAX;i++)fac[i]=fac[i-1]*i;
    finv[MAX-1]=fac[MAX-1].inv();
    for(int i=MAX-2;i>=0;i--)finv[i]=finv[i+1]*(i+1);
    for(int i=MAX-2;i>=1;i--)inv[i]=finv[i]+fac[i-1];
}
//階乗
mint factor(ll n,ll k){
  if (n<k) return 0;
  if (n<0 || k<0) return 0;
  return fac[n]*finv[k];
}
// 二項係数計算
mint COM(int n, int k){
    if (n < k) return 0;
    if (n < 0 || k < 0) return 0;
    return fac[n] * finv[k] * finv[n - k];
}
V<V<int>> graph;
mint dp[200005];
int tree[200005];
void dfs1(int now,int par){
    dp[now]=1;
     tree[now]++;
     if(graph[now].size()==1&&par!=-1)return;
    for(int v:graph[now]){
        if(par==v)continue;
        dfs1(v,now);
        tree[now]+=tree[v];
    }
    dp[now]=fac[tree[now]-1];
    for(int v:graph[now]){
        if(par==v)continue;
        dp[now]/=fac[tree[v]];
        dp[now]*=dp[v];
    }
}
V<mint> ans;
void dfs2(int now,int par){
  ans[now]=dp[now];
  if(par!=-1) {
     int t=tree[par]-tree[now];
     ans[now]*=dp[par]/dp[now]*fac[tree[now]]/fac[tree[par]-1]*fac[t-1];
     ans[now]/=fac[tree[now]-1];
     tree[now]=tree[par];
     ans[now]*=fac[tree[now]-1]/fac[t];
     dp[now]=ans[now];
  }
  for(int v:graph[now]){
      if(v==par)continue;
      dfs2(v,now);
  }
}
int main(){
int n;
cin>>n;
init();
graph.resize(n);
for(int i=0;i<n-1;i++){
    int a,b;cin>>a>>b;
    graph[--a].emplace_back(--b);
    graph[b].emplace_back(a);
}
dfs1(0,-1);
ans.resize(n);
dfs2(0,-1);
for(int i=0;i<n;i++)cout<<ans[i]<<"\n";
}


Compiler output:
a.cc:12:1: error: 'constxper' does not name a type; did you mean 'constexpr'?
   12 | constxper ll mod=1000000007;
      | ^~~~~~~~~
      | constexpr
a.cc: In constructor 'mint::mint(ll)':
a.cc:21:24: error: 'mod' was not declared in this scope; did you mean 'modf'?
   21 |     mint(ll vv=0){s(vv%mod+mod);}
      |                        ^~~
      |                        modf
a.cc: In member function 'mint& mint::s(ull)':
a.cc:23:14: error: 'mod' was not declared in this scope; did you mean 'modf'?
   23 |         v=vv<mod?vv:vv-mod;
      |              ^~~
      |              modf
a.cc: In member function 'mint& mint::operator-=(const mint&)':
a.cc:29:48: error: 'mod' was not declared in this scope; did you mean 'modf'?
   29 |     mint&operator-=(const mint&val){return s(v+mod-val.v);}
      |                                                ^~~
      |                                                modf
a.cc: In member function 'mint& mint::operator*=(const mint&)':
a.cc:31:24: error: 'mod' was not declared in this scope; did you mean 'modf'?
   31 |         v=ull(v)*val.v%mod;
      |                        ^~~
      |                        modf
a.cc: In member function 'mint mint::inv() const':
a.cc:48:33: error: 'mod' was not declared in this scope; did you mean 'modf'?
   48 |      mint inv()const{return pow(mod-2);}
      |                                 ^~~
      |                                 modf