結果

問題 No.2377 SUM AND XOR on Tree
ユーザー 👑 p-adic
提出日時 2024-01-23 15:11:12
言語 C++17(gcc12)
(gcc 12.3.0 + boost 1.87.0)
結果
AC  
実行時間 1,086 ms / 4,000 ms
コード長 53,202 bytes
コンパイル時間 16,067 ms
コンパイル使用メモリ 323,272 KB
最終ジャッジ日時 2025-02-18 22:21:52
ジャッジサーバーID
（参考情報） 		judge3 / judge5
このコードへのチャレンジ
（要ログイン）
ファイルパターン 結果
sample AC * 2
other AC * 33
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#ifndef INCLUDE_MODE
  #define INCLUDE_MODE
  // #define REACTIVE
  // #define USE_GETLINE
#endif
#ifdef INCLUDE_MAIN
IN VO Solve()
{
  CIN( int , N ); uint M = N - 1;
  gE<int>.resize( N );
  FOR( j , 0 , M ){
    CIN_ASSERT( uj , 1 , N ); CIN_ASSERT( vj , 1 , N );
    uj--; vj--;
    gE<int>[uj].push_back( vj ); gE<int>[vj].push_back( uj );
  }
  using T = vector<vector<ll>>;
  gA<T>.resize( N );
  FOR( i , 0 , N ){
    CIN( ll , Ai );
    T& A_i = gA<T>[i] = T( 30 , { 0 , 0 } );
    FOR( d , 0 , 30 ){
      A_i[d][ ( Ai >> d ) & 1 ] = 1;
    }
  }
  CEXPR( ll , P , 998244353 );
  auto f = [&]( const list<T>& a = {} , const int& i = 0 )
  {
    T& temp = gA<T>[i];
    FOR_ITR( a ){ 
      if( temp.empty() ){
    temp = *itr;
      } else if( ! itr->empty() ){
    T answer = T( 30 , { 0 , 0 } );
    FOR( d , 0 , 30 ){
      FOR( is , 0 , 2 ){
        ( answer[d][is] += temp[d][is] * ( *itr )[d][1] ) %= P;
        ( answer[d][is ^ 0] += temp[d][is] * ( *itr )[d][0] ) %= P;
        ( answer[d][is ^ 1] += temp[d][is] * ( *itr )[d][1] ) %= P;
      }
    }
    temp = move( answer );
      }
    }
    return temp;
  };
  Graph tree{ N , Get( gE<int> ) };
  DepthFirstSearchOnTree dfst{ tree , 0 };
  T val = dfst.RootingDP( f );
  ll answer = 0;
  ll power = 1;
  FOR( d , 0 , 30 ){
    ( answer += val[d][1] * power ) %= P;
    ( power <<= 1 ) < P ? power : power -= P;
  }
  RETURN( answer );
}
REPEAT_MAIN(1);
#else // INCLUDE_MAIN
#ifdef INCLUDE_SUB
// グラフ用
TE <TY T> Map<T,T> gF;
TE <TY T> VE<T> gA;
TE <TY PATH> VE<LI<PATH>> gE;
TE <TY T , TE <TY...> TY V> IN auto Get( CO V<T>& a ) { return [&]( CRI i = 0 ){ RE a[i]; }; }
// COMPAREに使用。圧縮時は削除する。
ll Naive( int N , int M , int K )
{
  ll answer = N + M + K;
  return answer;
}
// COMPAREに使用。圧縮時は削除する。
ll Answer( ll N , ll M , ll K )
{
  // START_WATCH;
  ll answer = N + M + K;
  // // TLに準じる乱択や全探索。デフォルトの猶予は100.0[ms]。
  // CEXPR( double , TL , 2000.0 );
  // while( CHECK_WATCH( TL ) ){
  // }
  return answer;
}
// 圧縮時は中身だけ削除する。
IN VO Experiment()
{
  // CEXPR( int , bound , 10 );
  // FOREQ( N , 0 , bound ){
  //   FOREQ( M , 0 , bound ){
  //     FOREQ( K , 0 , bound ){
  //    COUT( N , M , K , ":" , Naive( N , M , K ) );
  //     }
  //   }
  //   // cout << Naive( N ) << ",\n"[N==bound];
  // }
}
// 圧縮時は中身だけ削除する。
IN VO SmallTest()
{
  // CEXPR( int , bound , 10 );
  // FOREQ( N , 0 , bound ){
  //   FOREQ( M , 0 , bound ){
  //     FOREQ( K , 0 , bound ){
  //    COMPARE( N , M , K );
  //     }
  //   }
  //   // COMPARE( N );
  // }
}
#define INCLUDE_MAIN
#include __FILE__
#else // INCLUDE_SUB
#ifdef INCLUDE_LIBRARY
/*
C-x 3 C-x o C-x C-fによるファイル操作用
BFS:
c:/Users/user/Documents/Programming/Mathematics/Geometry/Graph/BreadthFirstSearch/compress.txt
CoordinateCompress:
c:/Users/user/Documents/Programming/Mathematics/SetTheory/DirectProduct/CoordinateCompress/compress.txt
DFSOnTree
c:/Users/user/Documents/Programming/Mathematics/Geometry/Graph/DepthFirstSearch/Tree/a.hpp
Divisor:
c:/Users/user/Documents/Programming/Mathematics/Arithmetic/Prime/Divisor/compress.txt
IntervalAddBIT
c:/Users/user/Documents/Programming/Mathematics/SetTheory/DirectProduct/AffineSpace/BIT/IntervalAdd/compress.txt
Polynomial
c:/Users/user/Documents/Programming/Mathematics/Polynomial/compress.txt
UnionFind
c:/Users/user/Documents/Programming/Mathematics/Geometry/Graph/UnionFindForest/compress.txt
*/
// VVV 常設でないライブラリは以下に挿入する。
// 構築 O(1)/O(|V_G|)（未初期化/初期化）
// Next()の反復でinitから到達可能な頂点を全探索 O(initの連結成分における辺の本数)
// Next()の反復とShift()で全探索 O(|V_G|+|E_G|)
// initからの到達可能性判定と深さ計算 O(initの連結成分における辺の本数)
// 連結成分の色分けと数え上げ O(|V_G|+|E_G|) 
template <typename GRAPH>
class VirtualBreadthFirstSearch :
  public PointedSet<int>
{
protected:
  GRAPH& m_G;
  bool m_initialised;
  // 次の探索点たちを格納。
  list<int> m_next;
  // 到達済みか否かを格納。
  vector<bool> m_found;
  // 到達済みかつ到達済みの点から辺を辿って到達した場合、その点を格納。
  vector<int> m_prev;
public:
  inline VirtualBreadthFirstSearch( GRAPH& G );
  inline VirtualBreadthFirstSearch( GRAPH& G , const int& init );
  // m_nextとm_foundとm_prevを初期化する。
  inline void Initialise();
  // m_nextとm_foundとm_prevを初期化した上でinitを最初の探索点に設定する。
  inline void Initialise( const int& init );
  // m_nextを初期化した上でm_foundとm_prevを非初期化せずinitを次の探索点に設定する。
  inline void Shift( const int& init );
  inline const int& size() const noexcept;
  inline vector<bool>::reference found( const int& i );
  inline const int& prev( const int& i );
  inline int Next();
  // 最初の未到達点（初期化時点ではinit）から到達できる未到達点の深さを格納し、
  // 到達できない未到達点や既到達点は深さの代わりに-1を格納。
  void SetDepth( vector<int>& depth );
  // 無向グラフである場合にのみサポート。
  // 未到達点の全体のなす部分グラフにおける連結成分の色分けと連結成分数を格納。
  void SetConnectedComponent( vector<int>& cc_num , int& count );
private:
  virtual void Push( list<int>& next , const int& i ) = 0;
};
template <typename GRAPH>
class BreadthFirstSearch :
  public VirtualBreadthFirstSearch<GRAPH>
{
public:
  template <typename...Args> inline BreadthFirstSearch( GRAPH& G , const Args&... args );
private:
  inline void Push( list<int>& next , const int& i );
};
template <typename GRAPH> inline VirtualBreadthFirstSearch<GRAPH>::VirtualBreadthFirstSearch( GRAPH& G ) : m_G( G ) , m_initialised( false ) , 
    m_next() , m_found() , m_prev() { static_assert( is_same_v<inner_t<GRAPH>,int> ); }
template <typename GRAPH> inline VirtualBreadthFirstSearch<GRAPH>::VirtualBreadthFirstSearch( GRAPH& G , const int& init ) : 
    VirtualBreadthFirstSearch<GRAPH>( G ) { Initialise( init ); }
template <typename GRAPH> template <typename...Args> inline BreadthFirstSearch<GRAPH>::BreadthFirstSearch( GRAPH& G , const Args&... args ) : 
    VirtualBreadthFirstSearch<GRAPH>( G , args... ) {}
template <typename GRAPH> inline void VirtualBreadthFirstSearch<GRAPH>::Initialise() { m_initialised = true; const int& V = size(); m_next.clear(); 
    m_found = vector<bool>( V ); m_prev = vector<int>( V , -1 ); }
template <typename GRAPH> inline void VirtualBreadthFirstSearch<GRAPH>::Initialise( const int& init ) { assert( ( this->init() = init ) < size() ); 
    Initialise(); m_next.push_back( init ); m_found[init] = true; }
template <typename GRAPH> inline void VirtualBreadthFirstSearch<GRAPH>::Shift( const int& init ) { if( m_initialised ){ const int& V = size(); 
    assert( ( this->init() = init ) < V ); m_next.clear(); if( ! m_found[init] ){ m_next.push_back( init ); m_found[init] = true; } } else { 
    Initialise( init ); } }
template <typename GRAPH> inline const int& VirtualBreadthFirstSearch<GRAPH>::size() const noexcept { return m_G.size(); }
template <typename GRAPH> inline vector<bool>::reference VirtualBreadthFirstSearch<GRAPH>::found( const int& i ) { assert( i < size() ); if( 
    !m_initialised ){ Initialise(); } return m_found[i]; }
template <typename GRAPH> inline const int& VirtualBreadthFirstSearch<GRAPH>::prev( const int& i ) { assert( i < size() ); if( !m_initialised ){ 
    Initialise(); } return m_prev[i]; }
template <typename GRAPH> inline int VirtualBreadthFirstSearch<GRAPH>::Next()
{
  if( m_next.empty() ){
    return -1;
  }
  const int i_curr = m_next.front();
  m_next.pop_front();
  auto&& edge = m_G.Edge( i_curr );
  while( ! edge.empty() ){
    const int& i = edge.front();
    auto&& found_i = m_found[i];
    if( ! found_i ){
      Push( m_next , i );
      m_prev[i] = i_curr;
      found_i = true;
    }
    edge.pop_front();
  }
  return i_curr;
}
template <typename GRAPH>
void VirtualBreadthFirstSearch<GRAPH>::SetDepth( vector<int>& depth )
{
  depth = vector<int>( size() , -1 );
  int i = Next();
  depth[i] = 0;
  
  while( ( i = Next() ) != -1 ){
    depth[i] = depth[prev( i )] + 1;
  }
  return;  
}
template <typename GRAPH>
void VirtualBreadthFirstSearch<GRAPH>::SetConnectedComponent( vector<int>& cc_num , int& count )
{
  const int& V = size();
  cc_num = vector<int>( V , -1 );
  count = 0;
  for( int i = 0 ; i < V ; i++ ){
    if( cc_num[i] == -1 ){
      Shift( i );
      int j = Next();
      if( j != -1 ){
    while( j != -1 ){
      // 無向グラフである場合は常にtrue。
      assert( cc_num[j] == -1 );
      cc_num[j] = count;
      j = Next();
    }
    count++;
      }
    }
  }
  return;
}
template <typename GRAPH> inline void BreadthFirstSearch<GRAPH>::Push( list<int>& next , const int& i ) { next.push_back( i ); }
template <typename GRAPH>
class DepthFirstSearch :
  public VirtualBreadthFirstSearch<GRAPH>
{
public:
  template <typename...Args> inline DepthFirstSearch( GRAPH& G , const Args&... args );
private:
  inline void Push( list<int>& next , const int& i );
};
template <typename GRAPH> template <typename...Args> inline DepthFirstSearch<GRAPH>::DepthFirstSearch( GRAPH& G , const Args&... args ) : 
    VirtualBreadthFirstSearch<GRAPH>( G , args... ) {}
template <typename GRAPH> inline void DepthFirstSearch<GRAPH>::Push( list<int>& next , const int& i ) { next.push_front( i ); }
// digitはAncestorとLCAにのみ使用。普段は0で良い。
// 2^16 = 65536
// 2^17 = 131072
// 2^18 = 262144
// Gが無向グラフとしての木である場合にのみサポート。
template <typename TREE>
class DepthFirstSearchOnTree :
  public DepthFirstSearch<TREE>
{
private:
  vector<int> m_reversed;
  vector<vector<int>> m_children;
  vector<int> m_children_num;
  bool m_set_children;
  vector<int> m_depth;
  bool m_set_depth;
  vector<int> m_height;
  bool m_set_height;
  vector<int> m_weight;
  bool m_set_weight;
  int m_digit;
  vector<vector<int>> m_doubling;
  bool m_set_doubling;
public:
  inline DepthFirstSearchOnTree( TREE& T , const int& root = 0 , const int& digit = 0 );
  inline void Initialise( ) = delete;
  inline void Initialise( const int& init ) = delete;
  inline void Shift( const int& init ) = delete;
  inline const int& Root() const;
  inline const int& Parent( const int& i );
  inline const vector<int>& Children( const int& i );
  inline const int& Depth( const int& i );
  inline const int& Height( const int& i );
  inline const int& Weight( const int& i );
  
  // 探索順にノードを番号づける。
  inline const int& NodeNumber( const int& i , const bool& reversed = false ) const;
  // 共通の親を持つノード間で昇順に番号づける。
  inline const int& ChildrenNumber( const int& i );  
  // 各ノードの高さ < 2^digitの場合のみサポート。
  // n階の親Parent^n( i )を返す。
  int Ancestor( int i , int n );
  int LCA( int i , int j );
  // LCAからi,j側に進める場合に進んだ先の頂点のラベルをi_prev,j_prevに格納する。
  int LCA( int i , int j , int& i_prev , int& j_prev );
  // Uを適当な型とし、
  // Fは写像f:U^{< \omega} \times N -> Uに相当する型。
  // 型推論のためにfはデフォルト引数で呼び出し可能とする。
  // 入力の範囲内で要件
  // (2) 任意の非負整数n,iとTの要素のみからなる任意の長さnの任意の列(u1,...,un)と
  //     その並び換え(v1,...,vn)に対しf((u1,...,un),i)=f((v1,...,vn),i)である。
  // を満たす場合のみサポート。
  // dp[j] = f(jの子ノードkを渡るdp[k]の列,j)
  // を満たす配列dpの根での値dp[m_init]をO(m_V)で求める。
  template <typename F> ret_t<F> RootingDP( F& f );
  // Uを適当な型とし、
  // Fは写像f:U^2->Uに相当する型。
  // Eは写像g:U \times \{0,1\} \times N^2 -> Uに相当する型。
  // 入力の範囲内で要件
  // (1) MがUのモノイド構造である。（以下演算を*と置く）
  // (2) 任意の非負整数n,iとTの要素のみからなる任意の長さnの任意の列(u1,...,un)と
  //     その並び換え(v1,...,vn)に対し
  //     f(u1*u2*...*un,j)=f(v1*v2*...*vn,j)である。
  // を満たす場合のみサポート。
  // dp[i][j] =
  // f(iを根とみなした時のjの子ノードkを渡るg(dp[i][k],jはiの子孫,k,j)のMに関する積,j)
  // を満たす二重配列dpの対角成分dp[i][i]をO(|V_T|)で求めてdに格納する。
  template <typename MONOID , typename F , typename G> void RerootingDP( MONOID& M , F& f , G& g , vector<inner_t<MONOID>>& d );
  // fはノードjごとのデータ（グラフ構造に依存しない）、gは有向辺b?(j,k):(k,j)ごとのデータに対応。
  // 例えば「パスの数」を求める時はm_Tが和、fが+1（葉かどうかに関係ない）、gがidでよい。
private:
  void SetChildren();
  void SetDepth();
  void SetHeight();
  void SetWeight();
  // 各ノードの高さ < 2^digitの場合のみサポート。
  // LCA()を呼ぶ前にAncestor()経由で完全にダブリングを設定するため、
  // 遅延評価してしまう
  // ../../../../Mathematics/Function/Iteration/Doubling/
  // のダブリングでは代用しない。
  void SetDoubling();
};
template <typename TREE> inline DepthFirstSearchOnTree<TREE>::DepthFirstSearchOnTree( TREE& T , const int& root , const int& digit ) :
  DepthFirstSearch<TREE>( T , root ) , m_reversed( this->size() ) , m_children() , m_set_children() , m_depth() , m_set_depth() , m_height() , 
      m_set_height() , m_weight() , m_set_weight() , m_digit( digit ) , m_doubling( m_digit ) , m_set_doubling()
{
  int n = this->size();
  
  while( --n >= 0 ){
    
    m_reversed[n] = this->Next();
  }
}
template <typename TREE> inline const int& DepthFirstSearchOnTree<TREE>::Root() const { return this->init(); }
template <typename TREE> inline const int& DepthFirstSearchOnTree<TREE>::Parent( const int& i ) { return this->prev( i ); }
template <typename TREE> inline const vector<int>& DepthFirstSearchOnTree<TREE>::Children( const int& i ) { if( ! m_set_children ){ SetChildren(); } 
    return m_children[i]; }
template <typename TREE> inline const int& DepthFirstSearchOnTree<TREE>::Depth( const int& i ) { if( ! m_set_depth ){ SetDepth(); } return 
    m_depth[i]; }
template <typename TREE> inline const int& DepthFirstSearchOnTree<TREE>::Height( const int& i ) { if( ! m_set_height ){ SetHeight(); } return 
    m_height[i]; }
template <typename TREE> inline const int& DepthFirstSearchOnTree<TREE>::Weight( const int& i ) { if( ! m_set_weight ){ SetWeight(); } return 
    m_weight[i]; }
template <typename TREE> inline const int& DepthFirstSearchOnTree<TREE>::NodeNumber( const int& i , const bool& reversed ) const { return 
    m_reversed[reversed ? i : this->size() - 1 - i]; }
template <typename TREE> inline const int& DepthFirstSearchOnTree<TREE>::ChildrenNumber( const int& i ) { if( ! m_set_children ){ SetChildren(); } 
    return m_children_num[i]; }
template <typename TREE>
int DepthFirstSearchOnTree<TREE>::Ancestor( int i , int n )
{
  if( ! m_set_doubling ){
    SetDoubling();
  }
  assert( ( n >> m_digit ) == 0 );
    
  int d = 0;
  
  while( n != 0 ){
    if( ( n & 1 ) == 1 ){
      assert( ( i = m_doubling[d][i] ) != -1 );
    }
    
    d++;
    n >>= 1;
  }
  return i;
}
template <typename TREE>
int DepthFirstSearchOnTree<TREE>::LCA( int i , int j )
{
  int diff = Depth( i ) - Depth( j );
  if( diff < 0 ){
    swap( i , j );
    diff *= -1;
  }
    
  i = Ancestor( i , diff );
  if( i == j ){
    return i;
      
  }
    
  int d = m_digit;
  while( --d >= 0 ){
    const vector<int>& doubling_d = m_doubling[d];
    const int& doubling_d_i = doubling_d[i];
    const int& doubling_d_j = doubling_d[j];
    if( doubling_d_i != doubling_d_j ){
      i = doubling_d_i;
      j = doubling_d_j;
      assert( i != -1 );
      assert( j != -1 );
    }
  }
  return Parent( i );
}
template <typename TREE>
int DepthFirstSearchOnTree<TREE>::LCA( int i , int j , int& i_prev , int& j_prev )
{
  if( i == j ){
    i_prev = j_prev = -1;
    return i;
  }
  
  int diff = Depth( i ) - Depth( j );
  if( diff < 0 ){
    return LCA( j , i , j_prev , i_prev );
  }
  
  if( diff > 0 ){
    i_prev = Ancestor( i , diff - 1 );
    i = Parent( i_prev );
    assert( i != -1 );
    
    if( i == j ){
      j_prev = -1;
      return i;
      
    }
    
  } else if( ! m_set_doubling ){
    SetDoubling();
  }
    
  int d = m_digit;
  while( --d >= 0 ){
    const vector<int>& doubling_d = m_doubling[d];
    const int& doubling_d_i = doubling_d[i];
    const int& doubling_d_j = doubling_d[j];
    if( doubling_d_i != doubling_d_j ){
      i = doubling_d_i;
      j = doubling_d_j;
      assert( i != -1 );
      assert( j != -1 );
    }
  }
  i_prev = i;
  j_prev = j;
  return Parent( i_prev );
}
template <typename TREE>
void DepthFirstSearchOnTree<TREE>::SetChildren()
{
  assert( !m_set_children );
  m_set_children = true;
  const int& V = this->size();
  m_children.resize( V );
  m_children_num.resize( V );
  
  for( int i = 0 ; i < V ; i++ ){
    const int& j = Parent( i );
    if( j == -1 ){
      m_children_num[i] = -1;
    } else {
      
      vector<int>& m_children_j = m_children[j];
      m_children_num[i] = m_children_j.size();
      m_children_j.push_back( i );
    }
  }
  return;
  
}
template <typename TREE>
void DepthFirstSearchOnTree<TREE>::SetDepth()
{
  assert( !m_set_depth );
  m_set_depth = true;
  const int& V = this->size();
  m_depth.resize( V );
  
  for( int i = 0 ; i < V ; i++ ){
    const int& reversed_i = m_reversed[i];
    const int& parent_i = Parent( reversed_i );
    if( parent_i != -1 ){
      m_depth[i] += m_depth[parent_i] + 1;
    }
  }
  return;
}
template <typename TREE>
void DepthFirstSearchOnTree<TREE>::SetHeight()
{
  assert( !m_set_height );
  m_set_height = true;
  const int& V = this->size();
  m_height.resize( V );
  
  for( int i = 0 ; i < V ; i++ ){
    const int& reversed_i = m_reversed[i];
    const int& parent_i = Parent( reversed_i );
    if( parent_i != -1 ){
      int& height_parent_i = m_height[parent_i];
      const int& height_i = m_height[reversed_i];
      height_parent_i > height_i ? height_parent_i : height_parent_i = height_i + 1;
    }
  }
  return;
}
template <typename TREE>
void DepthFirstSearchOnTree<TREE>::SetWeight()
{
  assert( !m_set_weight );
  m_set_weight = true;
  const int& V = this->size();
  m_weight.resize( V );
  
  for( int i = 0 ; i < V ; i++ ){
    const int& reversed_i = m_reversed[i];
    const int& parent_i = Parent( reversed_i );
    if( parent_i != -1 ){
      m_weight[parent_i] += m_weight[reversed_i] + 1;
    }
  }
  return;
}
template <typename TREE>
void DepthFirstSearchOnTree<TREE>::SetDoubling()
{
  assert( !m_set_doubling );
  m_set_doubling = true;
  const int& V = this->size();
  
  {
    
    vector<int>& doubling_0 = m_doubling[0];
    doubling_0.reserve( V );
    const int& r = Root();
    for( int i = 0 ; i < V ; i++ ){
      doubling_0.push_back( Parent( i ) );
    }
  }
  
  for( int d = 1 ; d < m_digit ; d++ ){
    vector<int>& doubling_d = m_doubling[d];
    vector<int>& doubling_d_minus = m_doubling[d-1];
    doubling_d.reserve( V );
    for( int i = 0 ; i < V ; i++ ){
      const int& doubling_d_minus_i = doubling_d_minus[i];
      doubling_d.push_back( doubling_d_minus_i == -1 ? -1 : doubling_d_minus[doubling_d_minus_i] );
    }
  }
  return;
}
template <typename TREE> template <typename F>
ret_t<F> DepthFirstSearchOnTree<TREE>::RootingDP( F& f )
{
  using U = ret_t<F>;
  static_assert( is_invocable_r_v<U,F,list<U>,int> );
  if( ! m_set_children ){
    SetChildren();
  }
  
  const int& V = this->size();
  vector<list<U>> children_value( V );
  U temp;
  
  for( int n = 0 ; n < V ; n++ ){
    
    const int& i = NodeNumber( n , true );
    const int& j = Parent( i );
    temp = f( children_value[i] , i );
    if( j != -1 ){
      children_value[j].push_back( temp );
    }
  }
  return temp;
}
  
template <typename TREE> template <typename MONOID , typename F , typename G>
void DepthFirstSearchOnTree<TREE>::RerootingDP( MONOID& M , F& f , G& g , vector<inner_t<MONOID>>& d )
{
  using U = inner_t<MONOID>;
  static_assert( is_invocable_r_v<U,F,U,U> && is_invocable_r_v<U,F,U,bool,int,int> );
  
  if( ! m_set_children ){
    SetChildren();
  }
  
  const int& V = this->size();
  const U& e = M.Unit();
  d.resize( V );
  // children_value[i][m]にiのm番目の子ノードjまでの計算値のfでの像を格納。
  vector<vector<U>> children_value( V );
  // left_sum[i][m]にchildren_value[i][0],...,children_value[i][m-1]の
  // gでの像のMに関する積を格納。
  vector<vector<U>> left_sum( V );
  // right_sum[i][m]にchildren_value[i][m+1],...,children_value[i][size_i-1]の
  // gでの像のM関する積を格納。
  vector<vector<U>> right_sum( V );
  
  for( int i = 0 ; i < V ; i++ ){
    children_value[i].resize( m_children[i].size() );
  }
  
  for( int n = 0 ; n < V ; n++ ){
    
    const int& i = NodeNumber( n , true );
    const vector<U>& children_value_i = children_value[i];
    const int size_i = children_value_i.size();
    U temp = e;
    vector<U>& left_sum_i = left_sum[i];
    left_sum_i.reserve( size_i + 1 );
    left_sum_i.push_back( temp );
    
    for( int m = 0 ; m < size_i ; m++ ){
      left_sum_i.push_back( temp = M.Product( temp , g( children_value_i[m] , true , i , m_children[i][m] ) ) );
    }
    
    const int& j = Parent( i );
    if( j != -1 ){
      
      children_value[j][m_children_num[i]] = f( temp , i );
    }
    temp = e;
    vector<U>& right_sum_i = right_sum[i];
    right_sum_i.resize( size_i );
    for( int m = 1 ; m <= size_i ; m++ ){
      right_sum_i[ size_i - m ] = temp;
      temp = M.Product( g( children_value_i[size_i - m] , true , i , m_children[i][size_i - m] ) , temp );
    }
  }
  // left_sum[i][m]にchildren_value[i][0],...,children_value[i][m-1]の
  // gでの像のMに関する積を格納していたが、さらにこれに親ノードの寄与も追加する。
  for( int n = 1 ; n < V ; n++ ){
    
    const int& i = NodeNumber( n );
    const int& j = Parent( i );
    const int& k = ChildrenNumber( i );
    vector<U>& left_sum_i = left_sum[i];
    vector<U>& right_sum_i = right_sum[i];
    const int size_i = right_sum_i.size();
    // children_value[j][0],...,children_value[j][k-1]のgでの像と
    // rest_j（既に計算済み）と
    // children_value[j][k+1],...,children_value[j][size_i-1]のgでの像と
    // のMに関する積のfでの像のgでの像。
    const U rest_i = g( f( M.Product( left_sum[j][k] , right_sum[j][k] ) , j ) , false , i , j );
    
    for( int m = 0 ; m <= size_i ; m++ ){
      // left_sum_imにrest_iと
      // children_value[i][0],...,children_value[i][m-1]のgでの像
      // のMに関する積を格納。
      U& left_sum_im = left_sum_i[m];
      left_sum_im = M.Product( rest_i , left_sum_im );
    }
  }
  for( int i = 0 ; i < V ; i++ ){
    // left_sum[i].back()はchildren_value_i[0],...,children_value_i[size_i-1]の
    // gでの像と親の寄与のMに関する積。
    d[i] = f( left_sum[i].back() , i );
  }
  return;
}
// AAA 常設でないライブラリは以上に挿入する。
#define INCLUDE_SUB
#include __FILE__
#else // INCLUDE_LIBRARY
#ifdef DEBUG
  #define _GLIBCXX_DEBUG
  #define REPEAT_MAIN( BOUND ) START_MAIN; signal( SIGABRT , &AlertAbort ); AutoCheck( exec_mode , use_getline ); if( exec_mode == sample_debug_mode 
      || exec_mode == submission_debug_mode || exec_mode == library_search_mode ){ RE 0; } else if( exec_mode == experiment_mode ){ Experiment(); RE 
      0; } else if( exec_mode == small_test_mode ){ SmallTest(); RE 0; }; DEXPR( int , bound_test_case_num , BOUND , min( BOUND , 100 ) ); int 
      test_case_num = 1; if( exec_mode == solve_mode ){ if CE( bound_test_case_num > 1 ){ SET_ASSERT( test_case_num , 1 , bound_test_case_num ); } } 
      else if( exec_mode == random_test_mode ){ CERR( "ランダムテストを行う回数を指定してください。" ); SET_LL( test_case_num ); } FINISH_MAIN
  #define DEXPR( LL , BOUND , VALUE , DEBUG_VALUE ) CEXPR( LL , BOUND , DEBUG_VALUE )
  #define ASSERT( A , MIN , MAX ) CERR( "ASSERTチェック： " , ( MIN ) , ( ( MIN ) <= A ? "<=" : ">" ) , A , ( A <= ( MAX ) ? "<=" : ">" ) , ( MAX ) 
      ); AS( ( MIN ) <= A && A <= ( MAX ) )
  #define SET_ASSERT( A , MIN , MAX ) if( exec_mode == solve_mode ){ SET_LL( A ); ASSERT( A , MIN , MAX ); } else if( exec_mode == random_test_mode 
      ){ CERR( #A , " = " , ( A = GetRand( MIN , MAX ) ) ); } else { AS( false ); }
  #define SOLVE_ONLY ST_AS( __FUNCTION__[0] == 'S' )
  #define CERR( ... ) VariadicCout( cerr , __VA_ARGS__ ) << endl
  #define COUT( ... ) VariadicCout( cout << "出力： " , __VA_ARGS__ ) << endl
  #define CERR_A( A , N ) OUTPUT_ARRAY( cerr , A , N ) << endl
  #define COUT_A( A , N ) cout << "出力： "; OUTPUT_ARRAY( cout , A , N ) << endl
  #define CERR_ITR( A ) OUTPUT_ITR( cerr , A ) << endl
  #define COUT_ITR( A ) cout << "出力： "; OUTPUT_ITR( cout , A ) << endl
#else
  #pragma GCC optimize ( "O3" )
  #pragma GCC optimize ( "unroll-loops" )
  #pragma GCC target ( "sse4.2,fma,avx2,popcnt,lzcnt,bmi2" )
  #define REPEAT_MAIN( BOUND ) START_MAIN; CEXPR( int , bound_test_case_num , BOUND ); int test_case_num = 1; if CE( bound_test_case_num > 1 ){ 
      SET_ASSERT( test_case_num , 1 , bound_test_case_num ); } FINISH_MAIN
  #define DEXPR( LL , BOUND , VALUE , DEBUG_VALUE ) CEXPR( LL , BOUND , VALUE )
  #define ASSERT( A , MIN , MAX ) AS( ( MIN ) <= A && A <= ( MAX ) )
  #define SET_ASSERT( A , MIN , MAX ) SET_LL( A ); ASSERT( A , MIN , MAX )
  #define SOLVE_ONLY 
  #define CERR( ... ) 
  #define COUT( ... ) VariadicCout( cout , __VA_ARGS__ ) << ENDL
  #define CERR_A( A , N ) 
  #define COUT_A( A , N ) OUTPUT_ARRAY( cout , A , N ) << ENDL
  #define CERR_ITR( A ) 
  #define COUT_ITR( A ) OUTPUT_ITR( cout , A ) << ENDL
#endif
#ifdef REACTIVE
  #define ENDL endl
#else
  #define ENDL "\n"
#endif
#ifdef USE_GETLINE
  #define SET_LL( A ) { GETLINE( A ## _str ); A = stoll( A ## _str ); }
  #define GETLINE_SEPARATE( SEPARATOR , ... ) SOLVE_ONLY; string __VA_ARGS__; VariadicGetline( cin , SEPARATOR , __VA_ARGS__ )
  #define GETLINE( ... ) SOLVE_ONLY; GETLINE_SEPARATE( '\n' , __VA_ARGS__ )
#else
  #define SET_LL( A ) cin >> A
  #define CIN( LL , ... ) SOLVE_ONLY; LL __VA_ARGS__; VariadicCin( cin , __VA_ARGS__ )
  #define SET_A( A , N ) SOLVE_ONLY; FOR( VARIABLE_FOR_CIN_A , 0 , N ){ cin >> A[VARIABLE_FOR_CIN_A]; }
  #define CIN_A( LL , A , N ) VE<LL> A( N ); SET_A( A , N );
#endif
#include <bits/stdc++.h>
using namespace std;
#define ATT __attribute__( ( target( "sse4.2,fma,avx2,popcnt,lzcnt,bmi2" ) ) )
#define START_MAIN int main(){ ios_base::sync_with_stdio( false ); cin.tie( nullptr )
#define FINISH_MAIN REPEAT( test_case_num ){ if CE( bound_test_case_num > 1 ){ CERR( "testcase " , VARIABLE_FOR_REPEAT_test_case_num , ":" ); } 
    Solve(); CERR( "" ); } }
#define START_WATCH chrono::system_clock::time_point watch = chrono::system_clock::now()
#define CURRENT_TIME static_cast<double>( chrono::duration_cast<chrono::microseconds>( chrono::system_clock::now() - watch ).count() / 1000.0 )
#define CHECK_WATCH( TL_MS ) ( CURRENT_TIME < TL_MS - 100.0 )
#define CEXPR( LL , BOUND , VALUE ) CE LL BOUND = VALUE
#define CIN_ASSERT( A , MIN , MAX ) decldecay_t( MAX ) A; SET_ASSERT( A , MIN , MAX )
#define FOR( VAR , INITIAL , FINAL_PLUS_ONE ) for( decldecay_t( FINAL_PLUS_ONE ) VAR = INITIAL ; VAR < FINAL_PLUS_ONE ; VAR ++ )
#define FOREQ( VAR , INITIAL , FINAL ) for( decldecay_t( FINAL ) VAR = INITIAL ; VAR <= FINAL ; VAR ++ )
#define FOREQINV( VAR , INITIAL , FINAL ) for( decldecay_t( INITIAL ) VAR = INITIAL ; VAR + 1 > FINAL ; VAR -- )
#define AUTO_ITR( ARRAY ) auto itr_ ## ARRAY = ARRAY .BE() , end_ ## ARRAY = ARRAY .EN()
#define FOR_ITR( ARRAY ) for( AUTO_ITR( ARRAY ) , itr = itr_ ## ARRAY ; itr_ ## ARRAY != end_ ## ARRAY ; itr_ ## ARRAY ++ , itr++ )
#define REPEAT( HOW_MANY_TIMES ) FOR( VARIABLE_FOR_REPEAT_ ## HOW_MANY_TIMES , 0 , HOW_MANY_TIMES )
#define SET_PRECISION( DECIMAL_DIGITS ) cout << fixed << setprecision( DECIMAL_DIGITS )
#define OUTPUT_ARRAY( OS , A , N ) FOR( VARIABLE_FOR_OUTPUT_ARRAY , 0 , N ){ OS << A[VARIABLE_FOR_OUTPUT_ARRAY] << (VARIABLE_FOR_OUTPUT_ARRAY==N-1
    ?"":" "); } OS
#define OUTPUT_ITR( OS , A ) { auto ITERATOR_FOR_OUTPUT_ITR = A.BE() , EN_FOR_OUTPUT_ITR = A.EN(); bool VARIABLE_FOR_OUTPUT_ITR = 
    ITERATOR_FOR_COUT_ITR != END_FOR_COUT_ITR; WH( VARIABLE_FOR_OUTPUT_ITR ){ OS << *ITERATOR_FOR_COUT_ITR; ( VARIABLE_FOR_OUTPUT_ITR = 
    ++ITERATOR_FOR_COUT_ITR != END_FOR_COUT_ITR ) ? OS : OS << " "; } } OS
#define RETURN( ... ) SOLVE_ONLY; COUT( __VA_ARGS__ ); RE
#define COMPARE( ... ) auto naive = Naive( __VA_ARGS__ ); auto answer = Answer( __VA_ARGS__ ); bool match = naive == answer; COUT( "(" , 
    #__VA_ARGS__ , ") == (" , __VA_ARGS__ , ") : Naive == " , naive , match ? "==" : "!=" , answer , "== Answer" ); if( !match ){ RE; }
// 圧縮用
#define TE template
#define TY typename
#define US using
#define ST static
#define AS assert
#define IN inline
#define CL class
#define PU public
#define OP operator
#define CE constexpr
#define CO const
#define NE noexcept
#define RE return 
#define WH while
#define VO void
#define VE vector
#define LI list
#define BE begin
#define EN end
#define SZ size
#define LE length
#define PW Power
#define MO move
#define TH this
#define CRI CO int&
#define CRUI CO uint&
#define CRL CO ll&
#define ST_AS static_assert
#define reMO_CO remove_const
#define is_COructible_v is_constructible_v
#define rBE rbegin
#define reSZ
// 型のエイリアス
#define decldecay_t( VAR ) decay_t<decltype( VAR )>
TE <TY F , TY...Args> US ret_t = decltype( declval<F>()( declval<Args>()... ) );
TE <TY T> US inner_t = TY T::type;
US uint = unsigned int;
US ll = long long;
US ull = unsigned long long;
US ld = long double;
US lld = __float128;
TE <TY INT> US T2 = pair<INT,INT>;
TE <TY INT> US T3 = tuple<INT,INT,INT>;
TE <TY INT> US T4 = tuple<INT,INT,INT,INT>;
US path = pair<int,ll>;
// 入出力用
TE <CL Traits> IN basic_istream<char,Traits>& VariadicCin( basic_istream<char,Traits>& is ) { RE is; }
TE <CL Traits , TY Arg , TY... ARGS> IN basic_istream<char,Traits>& VariadicCin( basic_istream<char,Traits>& is , Arg& arg , ARGS&... args ) { RE 
    VariadicCin( is >> arg , args... ); }
TE <CL Traits> IN basic_istream<char,Traits>& VariadicGetline( basic_istream<char,Traits>& is , CO char& separator ) { RE is; }
TE <CL Traits , TY Arg , TY... ARGS> IN basic_istream<char,Traits>& VariadicGetline( basic_istream<char,Traits>& is , CO char& separator , Arg& arg 
    , ARGS&... args ) { RE VariadicGetline( getline( is , arg , separator ) , separator , args... ); }
TE <CL Traits , TY Arg> IN basic_ostream<char,Traits>& operator<<( basic_ostream<char,Traits>& os , CO VE<Arg>& arg ) { auto BE = arg.BE() , EN = 
    arg.EN(); auto itr = BE; WH( itr != EN ){ ( itr == BE ? os : os << " " ) << *itr; itr++; } RE os; }
TE <CL Traits , TY Arg> IN basic_ostream<char,Traits>& VariadicCout( basic_ostream<char,Traits>& os , CO Arg& arg ) { RE os << arg; }
TE <CL Traits , TY Arg1 , TY Arg2 , TY... ARGS> IN basic_ostream<char,Traits>& VariadicCout( basic_ostream<char,Traits>& os , CO Arg1& arg1 , CO 
    Arg2& arg2 , CO ARGS&... args ) { RE VariadicCout( os << arg1 << " " , arg2 , args... ); }
// 算術用
TE <TY T> CE T PositiveBaseResidue( CO T& a , CO T& p ){ RE a >= 0 ? a % p : p - 1 - ( ( - ( a + 1 ) ) % p ); }
TE <TY T> CE T Residue( CO T& a , CO T& p ){ RE PositiveBaseResidue( a , p < 0 ? -p : p ); }
TE <TY T> CE T PositiveBaseQuotient( CO T& a , CO T& p ){ RE ( a - PositiveBaseResidue( a , p ) ) / p; }
TE <TY T> CE T Quotient( CO T& a , CO T& p ){ RE p < 0 ? PositiveBaseQuotient( -a , -p ) : PositiveBaseQuotient( a , p ); }
#define POWER( ANSWER , ARGUMENT , EXPONENT )               \
  ST_AS( ! is_same<decldecay_t( ARGUMENT ),int>::value && ! is_same<decldecay_t( ARGUMENT ),uint>::value ); \
  decldecay_t( ARGUMENT ) ANSWER{ 1 };                  \
  {                                 \
    decldecay_t( ARGUMENT ) ARGUMENT_FOR_SQUARE_FOR_POWER = ( ARGUMENT ); \
    decldecay_t( EXPONENT ) EXPONENT_FOR_SQUARE_FOR_POWER = ( EXPONENT ); \
    WH( EXPONENT_FOR_SQUARE_FOR_POWER != 0 ){               \
      if( EXPONENT_FOR_SQUARE_FOR_POWER % 2 == 1 ){         \
    ANSWER *= ARGUMENT_FOR_SQUARE_FOR_POWER;            \
      }                                 \
      ARGUMENT_FOR_SQUARE_FOR_POWER *= ARGUMENT_FOR_SQUARE_FOR_POWER;   \
      EXPONENT_FOR_SQUARE_FOR_POWER /= 2;               \
    }                                   \
  }                                 \
#define POWER_MOD( ANSWER , ARGUMENT , EXPONENT , MODULO )      \
  ll ANSWER{ 1 };                           \
  {                                 \
    ll ARGUMENT_FOR_SQUARE_FOR_POWER = ( ( ARGUMENT ) % ( MODULO ) ) % ( MODULO ); \
    ARGUMENT_FOR_SQUARE_FOR_POWER < 0 ? ARGUMENT_FOR_SQUARE_FOR_POWER += ( MODULO ) : ARGUMENT_FOR_SQUARE_FOR_POWER; \
    decldecay_t( EXPONENT ) EXPONENT_FOR_SQUARE_FOR_POWER = ( EXPONENT ); \
    WH( EXPONENT_FOR_SQUARE_FOR_POWER != 0 ){               \
      if( EXPONENT_FOR_SQUARE_FOR_POWER % 2 == 1 ){         \
    ANSWER = ( ANSWER * ARGUMENT_FOR_SQUARE_FOR_POWER ) % ( MODULO ); \
      }                                 \
      ARGUMENT_FOR_SQUARE_FOR_POWER = ( ARGUMENT_FOR_SQUARE_FOR_POWER * ARGUMENT_FOR_SQUARE_FOR_POWER ) % ( MODULO ); \
      EXPONENT_FOR_SQUARE_FOR_POWER /= 2;               \
    }                                   \
  }                                 \
#define FACTORIAL_MOD( ANSWER , ANSWER_INV , INVERSE , MAX_INDEX , CE_LENGTH , MODULO ) \
  ll ANSWER[CE_LENGTH];                         \
  ll ANSWER_INV[CE_LENGTH];                     \
  ll INVERSE[CE_LENGTH];                        \
  {                                 \
    ll VARIABLE_FOR_PRODUCT_FOR_FACTORIAL = 1;              \
    ANSWER[0] = VARIABLE_FOR_PRODUCT_FOR_FACTORIAL;         \
    FOREQ( i , 1 , MAX_INDEX ){                     \
      ANSWER[i] = ( VARIABLE_FOR_PRODUCT_FOR_FACTORIAL *= i ) %= ( MODULO ); \
    }                                   \
    ANSWER_INV[0] = ANSWER_INV[1] = INVERSE[1] = VARIABLE_FOR_PRODUCT_FOR_FACTORIAL = 1; \
    FOREQ( i , 2 , MAX_INDEX ){                     \
      ANSWER_INV[i] = ( VARIABLE_FOR_PRODUCT_FOR_FACTORIAL *= INVERSE[i] = ( MODULO ) - ( ( ( ( MODULO ) / i ) * INVERSE[ ( MODULO ) % i ] ) % ( 
          MODULO ) ) ) %= ( MODULO ); \
    }                                   \
  }                                 \
// 二分探索用
// EXPRESSIONがANSWERの広義単調関数の時、EXPRESSION >= CO_TARGETの整数解を格納。
#define BS( ANSWER , MINIMUM , MAXIMUM , EXPRESSION , DESIRED_INEQUALITY , CO_TARGET , INEQUALITY_FOR_CHECK , UPDATE_U , UPDATE_L , UPDATE_ANSWER ) 
    \
  ST_AS( ! is_same<decldecay_t( CO_TARGET ),uint>::value && ! is_same<decldecay_t( CO_TARGET ),ull>::value ); \
  ll ANSWER = MINIMUM;                          \
  {                                 \
    ll L_BS = MINIMUM;                          \
    ll U_BS = MAXIMUM;                          \
    ANSWER = UPDATE_ANSWER;                     \
    ll EXPRESSION_BS;                           \
    CO ll CO_TARGET_BS = ( CO_TARGET );         \
    ll DIFFERENCE_BS;                           \
    WH( L_BS < U_BS ){                      \
      DIFFERENCE_BS = ( EXPRESSION_BS = ( EXPRESSION ) ) - CO_TARGET_BS; \
      CERR( "二分探索中：" , "L_BS =" , L_BS , "<=" , #ANSWER , "=" , ANSWER , "<=" , U_BS , "= U_BS :" , #EXPRESSION , "-" , #CO_TARGET , "=" , 
          EXPRESSION_BS , "-" , CO_TARGET_BS , "=" , DIFFERENCE_BS ); \
      if( DIFFERENCE_BS INEQUALITY_FOR_CHECK 0 ){           \
    U_BS = UPDATE_U;                        \
      } else {                              \
    L_BS = UPDATE_L;                        \
      }                                 \
      ANSWER = UPDATE_ANSWER;                       \
    }                                   \
    if( L_BS > U_BS ){                          \
      CERR( "二分探索失敗：" , "L_BS =" , L_BS , ">" , U_BS , "= U_BS :" , #ANSWER , ":=" , #MAXIMUM , "+ 1 =" , MAXIMUM + 1  ); \
      CERR( "二分探索マクロにミスがある可能性があります。変更前の版に戻してください。" ); \
      ANSWER = MAXIMUM + 1;                     \
    } else {                                \
      CERR( "二分探索終了：" , "L_BS =" , L_BS , "<=" , #ANSWER , "=" , ANSWER , "<=" , U_BS , "= U_BS" ); \
      CERR( "二分探索が成功したかを確認するために" , #EXPRESSION , "を計算します。" ); \
      CERR( "成功判定が不要な場合はこの計算を削除しても構いません。" ); \
      EXPRESSION_BS = ( EXPRESSION );                   \
      CERR( "二分探索結果：" , #EXPRESSION , "=" , EXPRESSION_BS , ( EXPRESSION_BS > CO_TARGET_BS ? ">" : EXPRESSION_BS < CO_TARGET_BS ? "<" : "=" ) 
          , CO_TARGET_BS ); \
      if( EXPRESSION_BS DESIRED_INEQUALITY CO_TARGET_BS ){      \
    CERR( "二分探索成功：" , #ANSWER , ":=" , ANSWER );     \
      } else {                              \
    CERR( "二分探索失敗：" , #ANSWER , ":=" , #MAXIMUM , "+ 1 =" , MAXIMUM + 1 ); \
    CERR( "単調でないか、単調増加性と単調減少性を逆にしてしまったか、探索範囲内に解が存在しません。" ); \
    ANSWER = MAXIMUM + 1;                       \
      }                                 \
    }                                   \
  }                                 \
// 単調増加の時にEXPRESSION >= CO_TARGETの最小解を格納。
#define BS1( ANSWER , MINIMUM , MAXIMUM , EXPRESSION , CO_TARGET )  \
  BS( ANSWER , MINIMUM , MAXIMUM , EXPRESSION , >= , CO_TARGET , >= , ANSWER , ANSWER + 1 , ( L_BS + U_BS ) / 2 ) \
// 単調増加の時にEXPRESSION <= CO_TARGETの最大解を格納。
#define BS2( ANSWER , MINIMUM , MAXIMUM , EXPRESSION , CO_TARGET )  \
  BS( ANSWER , MINIMUM , MAXIMUM , EXPRESSION , <= , CO_TARGET , > , ANSWER - 1 , ANSWER , ( L_BS + 1 + U_BS ) / 2 ) \
// 単調減少の時にEXPRESSION >= CO_TARGETの最大解を格納。
#define BS3( ANSWER , MINIMUM , MAXIMUM , EXPRESSION , CO_TARGET )  \
  BS( ANSWER , MINIMUM , MAXIMUM , EXPRESSION , >= , CO_TARGET , < , ANSWER - 1 , ANSWER , ( L_BS + 1 + U_BS ) / 2 ) \
// 単調減少の時にEXPRESSION <= CO_TARGETの最小解を格納。
#define BS4( ANSWER , MINIMUM , MAXIMUM , EXPRESSION , CO_TARGET )  \
  BS( ANSWER , MINIMUM , MAXIMUM , EXPRESSION , <= , CO_TARGET , <= , ANSWER , ANSWER + 1 , ( L_BS + U_BS ) / 2 ) \
// t以下の値が存在すればその最大値のiterator、存在しなければend()を返す。
TE <TY T> IN TY set<T>::iterator MaximumLeq( set<T>& S , CO T& t ) { CO auto EN = S.EN(); if( S.empty() ){ RE EN; } auto itr = S.upper_bound( t ); 
    RE itr == EN ? S.find( *( S.rBE() ) ) : itr == S.BE() ? EN : --itr; }
// t未満の値が存在すればその最大値のiterator、存在しなければend()を返す。
TE <TY T> IN TY set<T>::iterator MaximumLt( set<T>& S , CO T& t ) { CO auto EN = S.EN(); if( S.empty() ){ RE EN; } auto itr = S.lower_bound( t ); RE 
    itr == EN ? S.find( *( S.rBE() ) ) : itr == S.BE() ? EN : --itr; }
// t以上の値が存在すればその最小値のiterator、存在しなければend()を返す。
TE <TY T> IN TY set<T>::iterator MinimumGeq( set<T>& S , CO T& t ) { RE S.lower_bound( t ); }
// tより大きい値が存在すればその最小値のiterator、存在しなければend()を返す。
TE <TY T> IN TY set<T>::iterator MinimumGt( set<T>& S , CO T& t ) { RE S.upper_bound( t ); }
// データ構造用
TE <TY T , TE <TY...> TY V> IN V<T> OP+( CO V<T>& a0 , CO V<T>& a1 ) { if( a0.empty() ){ RE a1; } if( a1.empty() ){ RE a0; } AS( a0.SZ() == a1.SZ() 
    ); V<T> answer{}; for( auto itr0 = a0.BE() , itr1 = a1.BE() , EN0 = a0.EN(); itr0 != EN0 ; itr0++ , itr1++ ){ answer.push_back( *itr0 + *itr1 ); 
    } RE answer; }
TE <TY T , TY U> IN pair<T,U> OP+( CO pair<T,U>& t0 , CO pair<T,U>& t1 ) { RE { t0.first + t1.first , t0.second + t1.second }; }
TE <TY T , TY U , TY V> IN tuple<T,U,V> OP+( CO tuple<T,U,V>& t0 , CO tuple<T,U,V>& t1 ) { RE { get<0>( t0 ) + get<0>( t1 ) , get<1>( t0 ) + get<1>( 
    t1 ) , get<2>( t0 ) + get<2>( t1 ) }; }
TE <TY T , TY U , TY V , TY W> IN tuple<T,U,V,W> OP+( CO tuple<T,U,V,W>& t0 , CO tuple<T,U,V,W>& t1 ) { RE { get<0>( t0 ) + get<0>( t1 ) , get<1>( 
    t0 ) + get<1>( t1 ) , get<2>( t0 ) + get<2>( t1 ) , get<3>( t0 ) + get<3>( t1 ) }; }
TE <TY T> IN T Add( CO T& t0 , CO T& t1 ) { RE t0 + t1; }
TE <TY T> IN T XorAdd( CO T& t0 , CO T& t1 ){ RE t0 ^ t1; }
TE <TY T> IN T Multiply( CO T& t0 , CO T& t1 ) { RE t0 * t1; }
TE <TY T> IN CO T& Zero() { ST CO T z{}; RE z; }
TE <TY T> IN CO T& One() { ST CO T o = 1; RE o; }\
TE <TY T> IN T AddInv( CO T& t ) { RE -t; }
TE <TY T> IN T Id( CO T& v ) { RE v; }
TE <TY T> IN T Min( CO T& a , CO T& b ){ RE a < b ? a : b; }
TE <TY T> IN T Max( CO T& a , CO T& b ){ RE a < b ? b : a; }
// グリッド問題用
int H , W , H_minus , W_minus , HW;
VE<VE<bool>> non_wall;
IN T2<int> EnumHW( CRI v ) { RE { v / W , v % W }; }
IN int EnumHW_inv( CRI h , CRI w ) { RE h * W + w; }
CO string direction[4] = {"U","R","D","L"};
// (i,j)->(k,h)の方向番号を取得
IN int DirectionNumberOnGrid( CRI i , CRI j , CRI k , CRI h ){RE i<k?2:i>k?0:j<h?1:j>h?3:(AS(false),-1);}
// v->wの方向番号を取得
IN int DirectionNumberOnGrid( CRI v , CRI w ){auto [i,j]=EnumHW(v);auto [k,h]=EnumHW(w);RE DirectionNumberOnGrid(i,j,k,h);}
// 方向番号の反転U<->D、R<->L
IN int ReverseDirectionNumberOnGrid( CRI n ){AS(0<=n&&n<4);RE(n+2)%4;}
IN VO SetEdgeOnGrid( CO string& Si , CRI i , LI<int> ( &e )[] , CO char& walkable = '.' ){FOR(j,0,W){if(Si[j]==walkable){int v = EnumHW_inv(i,j);if
    (i>0){e[EnumHW_inv(i-1,j)].push_back(v);}if(i+1<H){e[EnumHW_inv(i+1,j)].push_back(v);}if(j>0){e[EnumHW_inv(i,j-1)].push_back(v);}if(j+1<W
    ){e[EnumHW_inv(i,j+1)].push_back(v);}}}}
IN VO SetEdgeOnGrid( CO string& Si , CRI i , LI<path> ( &e )[] , CO char& walkable = '.' ){FOR(j,0,W){if(Si[j]==walkable){CO int v=EnumHW_inv(i,j
    );if(i>0){e[EnumHW_inv(i-1,j)].push_back({v,1});}if(i+1<H){e[EnumHW_inv(i+1,j)].push_back({v,1});}if(j>0){e[EnumHW_inv(i,j-1)].push_back({v,1}
    );}if(j+1<W){e[EnumHW_inv(i,j+1)].push_back({v,1});}}}}
IN VO SetWallOnGrid( CO string& Si , CRI i , VE<VE<bool>>& non_wall , CO char& walkable = '.'  , CO char& unwalkable = '#' ){non_wall.push_back(VE
    <bool>(W));auto& non_wall_i=non_wall[i];FOR(j,0,W){non_wall_i[j]=Si[j]==walkable?true:(assert(Si[j]==unwalkable),false);}}
// デバッグ用
#ifdef DEBUG
  IN VO AlertAbort( int n ) { CERR( "abort関数が呼ばれました。assertマクロのメッセージが出力されていない場合はオーバーフローの有無を確認をしてくださ
      い。" ); }
  VO AutoCheck( int& exec_mode , CO bool& use_getline );
  IN VO Solve();
  IN VO Experiment();
  IN VO SmallTest();
  IN VO RandomTest();
  ll GetRand( CRL Rand_min , CRL Rand_max );
  IN VO BreakPoint( CRI LINE ) {}
  int exec_mode;
  CEXPR( int , solve_mode , 0 );
  CEXPR( int , sample_debug_mode , 1 );
  CEXPR( int , submission_debug_mode , 2 );
  CEXPR( int , library_search_mode , 3 );
  CEXPR( int , experiment_mode , 4 );
  CEXPR( int , small_test_mode , 5 );
  CEXPR( int , random_test_mode , 6 );
  #ifdef USE_GETLINE
    CEXPR( bool , use_getline , true );
  #else
    CEXPR( bool , use_getline , false );
  #endif
#else
  ll GetRand( CRL Rand_min , CRL Rand_max ) { ll answer = time( NULL ); RE answer * rand() % ( Rand_max + 1 - Rand_min ) + Rand_min; }
#endif
// VVV 常設ライブラリは以下に挿入する。
// Map
// c:/Users/user/Documents/Programming/Mathematics/Function/Map/compress.txt
CL is_ordered{PU:is_ordered()= delete;TE <TY T> ST CE auto Check(CO T& t)-> decltype(t < t,true_type());ST CE false_type Check(...);TE <TY T> ST CE 
    CO bool value = is_same_v< decltype(Check(declval<T>())),true_type >;};
TE <TY T , TY U>US Map = conditional_t<is_COructible_v<unordered_map<T,int>>,unordered_map<T,U>,conditional_t<is_ordered::value<T>,map<T,U>,VO>>;
// Algebra
// c:/Users/user/Documents/Programming/Mathematics/Algebra/compress.txt
#define DC_OF_CPOINT(POINT)IN CO U& POINT()CO NE
#define DC_OF_POINT(POINT)IN U& POINT() NE
#define DF_OF_CPOINT(POINT)TE <TY U> IN CO U& VirtualPointedSet<U>::POINT()CO NE{RE Point();}
#define DF_OF_POINT(POINT)TE <TY U> IN U& VirtualPointedSet<U>::POINT()NE{RE Point();}
TE <TY U>CL VirtualPointedSet{PU:virtual CO U& Point()CO NE = 0;virtual U& Point() NE = 0;DC_OF_CPOINT(Unit);DC_OF_CPOINT(Zero);DC_OF_CPOINT(One
    );DC_OF_CPOINT(Infty);DC_OF_CPOINT(size);DC_OF_POINT(init);DC_OF_POINT(root);};TE <TY U>CL PointedSet:virtual PU VirtualPointedSet<U>{PU:U m_b_U
    ;IN PointedSet(CO U& b_u = U());IN CO U& Point()CO NE;IN U& Point() NE;};TE <TY U>CL VirtualNSet{PU:virtual U Transfer(CO U& u)= 0;IN U Inverse
    (CO U& u);};TE <TY U,TY F_U>CL AbstractNSet:virtual PU VirtualNSet<U>{PU:F_U& m_f_U;IN AbstractNSet(F_U& f_U);IN U Transfer(CO U& u);};TE <TY U
    >CL VirtualMagma{PU:virtual U Product(CO U& u0,CO U& u1)= 0;IN U Sum(CO U& u0,CO U& u1);};TE <TY U,TY M_U>CL AbstractMagma:virtual PU 
    VirtualMagma<U>{PU:M_U& m_m_U;IN AbstractMagma(M_U& m_U);IN U Product(CO U& u0,CO U& u1);};
TE <TY U> IN PointedSet<U>::PointedSet(CO U& b_U):m_b_U(b_U){}TE <TY U> IN CO U& PointedSet<U>::Point()CO NE{RE m_b_U;}TE <TY U> IN U& PointedSet<U
    >::Point()NE{RE m_b_U;}DF_OF_CPOINT(Unit);DF_OF_CPOINT(Zero);DF_OF_CPOINT(One);DF_OF_CPOINT(Infty);DF_OF_CPOINT(size);DF_OF_POINT(init
    );DF_OF_POINT(root);TE <TY U,TY F_U> IN AbstractNSet<U,F_U>::AbstractNSet(F_U& f_U):m_f_U(f_U){ST_AS(is_invocable_r_v<U,F_U,U>);}TE <TY U,TY F_U
    > IN U AbstractNSet<U,F_U>::Transfer(CO U& u){RE m_f_U(u);}TE <TY U> IN U VirtualNSet<U>::Inverse(CO U& u){RE Transfer(u);}TE <TY U,TY M_U> IN 
    AbstractMagma<U,M_U>::AbstractMagma(M_U& m_U):m_m_U(m_U){ST_AS(is_invocable_r_v<U,M_U,U,U>);}TE <TY U,TY M_U> IN U AbstractMagma<U,M_U>::Product
    (CO U& u0,CO U& u1){RE m_m_U(u0,u1);}TE <TY U> IN U VirtualMagma<U>::Sum(CO U& u0,CO U& u1){RE Product(u0,u1);}
TE <TY U>CL VirtualMonoid:virtual PU VirtualMagma<U>,virtual PU VirtualPointedSet<U>{};TE <TY U = ll>CL AdditiveMonoid:virtual PU VirtualMonoid<U
    >,PU PointedSet<U>{PU:IN U Product(CO U& u0,CO U& u1);};TE <TY U = ll>CL MultiplicativeMonoid:virtual PU VirtualMonoid<U>,PU PointedSet<U>{PU:IN 
    MultiplicativeMonoid(CO U& e_U);IN U Product(CO U& u0,CO U& u1);};TE <TY U,TY M_U>CL AbstractMonoid:virtual PU VirtualMonoid<U>,PU AbstractMagma
    <U,M_U>,PU PointedSet<U>{PU:IN AbstractMonoid(M_U& m_U,CO U& e_U);IN U Product(CO U& u0,CO U& u1);};
TE <TY U> IN MultiplicativeMonoid<U>::MultiplicativeMonoid(CO U& e_U):PointedSet<U>(e_U){}TE <TY U,TY M_U> IN AbstractMonoid<U,M_U>::AbstractMonoid
    (M_U& m_U,CO U& e_U):AbstractMagma<U,M_U>(m_U),PointedSet<U>(e_U){}TE <TY U> IN U AdditiveMonoid<U>::Product(CO U& u0,CO U& u1){RE u0 + u1;}TE 
    <TY U> IN U MultiplicativeMonoid<U>::Product(CO U& u0,CO U& u1){RE u0 * u1;}TE <TY U,TY M_U> IN U AbstractMonoid<U,M_U>::Product(CO U& u0,CO U& 
    u1){RE m_m_U(u0,u1);}
TE <TY U>CL VirtualGroup:virtual PU VirtualMonoid<U>,virtual PU VirtualPointedSet<U>,virtual PU VirtualNSet<U>{};TE <TY U = ll>CL AdditiveGroup
    :virtual PU VirtualGroup<U>,PU AdditiveMonoid<U>{PU:IN U Transfer(CO U& u);};TE <TY U,TY M_U,TY I_U>CL AbstractGroup:virtual PU VirtualGroup<U
    >,PU AbstractMonoid<U,M_U>,PU AbstractNSet<U,I_U>{PU:IN AbstractGroup(M_U& m_U,CO U& e_U,I_U& i_U);IN U Transfer(CO U& u);};TE <TY U,TY M_U,TY 
    I_U> IN AbstractGroup<U,M_U,I_U>::AbstractGroup(M_U& m_U,CO U& e_U,I_U& i_U):AbstractMonoid<U,M_U>(m_U,e_U),AbstractNSet<U,I_U>(i_U){}TE <TY U
    ,TY M_U,TY I_U> IN U AbstractGroup<U,M_U,I_U>::Transfer(CO U& u){RE m_i_U(u);}TE <TY U> IN U AdditiveGroup<U>::Transfer(CO U& u){RE -u;}
TE <TY U,TY GROUP,TY MONOID>CL VirtualRing{PU:GROUP m_R0;MONOID m_R1;IN VirtualRing(GROUP R0,MONOID R1);IN U Sum(CO U& u0,CO U& u1);IN CO U& Zero
    ()CO NE;IN U Inverse(CO U& u);IN U Product(CO U& u0,CO U& u1);IN CO U& One()CO NE;IN GROUP& AdditiveGroup()NE;IN MONOID& MultiplicativeMonoid
    ()NE;};TE <TY U = ll>CL Ring:virtual PU VirtualRing<U,AdditiveGroup<U>,MultiplicativeMonoid<U>>{PU:IN Ring(CO U& one_U);};TE <TY U,TY A_U,TY I_U
    ,TY M_U>CL AbstractRing:virtual PU VirtualRing<U,AbstractGroup<U,A_U,I_U>,AbstractMonoid<U,M_U>>{PU:IN AbstractRing(A_U& a_U,CO U& z_U,I_U& i_U
    ,M_U& m_U,CO U& e_U);};
TE <TY U,TY GROUP,TY MONOID> IN VirtualRing<U,GROUP,MONOID>::VirtualRing(GROUP R0,MONOID R1):m_R0(MO(R0)),m_R1(MO(R1)){}TE <TY U> IN Ring<U>::Ring
    (CO U& one_U):VirtualRing<U,AdditiveGroup<U>,MultiplicativeMonoid<U>>(AdditiveGroup<U>(),MultiplicativeMonoid<U>(one_U)){}TE <TY U,TY A_U,TY I_U
    ,TY M_U> IN AbstractRing<U,A_U,I_U,M_U>::AbstractRing(A_U& a_U,CO U& z_U,I_U& i_U,M_U& m_U,CO U& e_U):VirtualRing<U,AbstractGroup<U,A_U,I_U
    >,AbstractMonoid<U,M_U>>(AbstractGroup<U,A_U,I_U>(a_U,z_U,i_U),AbstractMonoid<U,M_U>(m_U,e_U)){}TE <TY U,TY GROUP,TY MONOID> IN U VirtualRing<U
    ,GROUP,MONOID>::Sum(CO U& u0,CO U& u1){RE m_R0.Sum(u0,u1);}TE <TY U,TY GROUP,TY MONOID> IN CO U& VirtualRing<U,GROUP,MONOID>::Zero()CO NE{RE 
    m_R0.Zero();}TE <TY U,TY GROUP,TY MONOID> IN U VirtualRing<U,GROUP,MONOID>::Inverse(CO U& u){RE m_R0.Inverse(u);}TE <TY U,TY GROUP,TY MONOID> IN 
    U VirtualRing<U,GROUP,MONOID>::Product(CO U& u0,CO U& u1){RE m_R1.Product(u0,u1);}TE <TY U,TY GROUP,TY MONOID> IN CO U& VirtualRing<U,GROUP
    ,MONOID>::One()CO NE{RE m_R1.One();}TE <TY U,TY GROUP,TY MONOID> IN GROUP& VirtualRing<U,GROUP,MONOID>::AdditiveGroup()NE{RE m_R0;}TE <TY U,TY 
    GROUP,TY MONOID> IN MONOID& VirtualRing<U,GROUP,MONOID>::MultiplicativeMonoid()NE{RE m_R1;}
// Graph
// c:/Users/user/Documents/Programming/Mathematics/Geometry/Graph/compress.txt
#define SFINAE_FOR_GRAPH TY T,TY E,enable_if_t<is_invocable_v<E,T>,void*> PTR
TE <TY T,TY R1,TY R2,TY E>CL VirtualGraph:PU PointedSet<int>{PU:E m_edge;IN VirtualGraph(CRI SZ,E edge);virtual R1 Enumeration(CRI i)= 0;virtual R2 
    Enumeration_inv(CO T& t)= 0;IN VO Reset();IN E& edge()NE;IN ret_t<E,T> Edge(CO T& t);US type = T;};TE <TY E>CL Graph:virtual PU VirtualGraph<int
    ,CRI,CRI,E>{PU:IN Graph(CRI SZ,E edge);IN CRI Enumeration(CRI i);IN CRI Enumeration_inv(CRI t);TE <TY F> IN Graph<F> GetGraph(F edge)CO;};TE <TY 
    T,TY Enum_T,TY Enum_T_inv,TY E>CL EnumerationGraph:virtual PU VirtualGraph<T,ret_t<Enum_T,int>,ret_t<Enum_T_inv,T>,E>{PU:Enum_T& m_enum_T
    ;Enum_T_inv& m_enum_T_inv;IN EnumerationGraph(CRI SZ,Enum_T& enum_T,Enum_T_inv& enum_T_inv,E edge);IN ret_t<Enum_T,int> Enumeration(CRI i);IN 
    ret_t<Enum_T_inv,T> Enumeration_inv(CO T& t);TE <TY F> IN EnumerationGraph<T,Enum_T,Enum_T_inv,F> GetGraph(F edge)CO;};TE <TY Enum_T,TY 
    Enum_T_inv,TY E> EnumerationGraph(CRI SZ,Enum_T& enum_T,Enum_T_inv& enum_T_inv,E edge)-> EnumerationGraph<decldecay_t(declval<Enum_T>()(0
    )),Enum_T,Enum_T_inv,E>;TE <SFINAE_FOR_GRAPH = nullptr>CL MemorisationGraph:virtual PU VirtualGraph<T,T,CRI,E>{PU:int m_LE;VE<T> m_memory;Map<T
    ,int> m_memory_inv;IN MemorisationGraph(CRI SZ,E edge);IN T Enumeration(CRI i);IN CRI Enumeration_inv(CO T& t);IN VO Reset();TE <TY F> IN 
    MemorisationGraph<T,F> GetGraph(F edge)CO;};TE <TY E> MemorisationGraph(CRI SZ,E edge)-> MemorisationGraph<decldecay_t(declval<E>()().back()),E
    >;TE <TY E> MemorisationGraph(CRI SZ,E edge)-> MemorisationGraph<decldecay_t(get<0>(declval<E>()().back())),E>;
TE <TY T,TY R1,TY R2,TY E> IN VirtualGraph<T,R1,R2,E>::VirtualGraph(CRI SZ,E edge):PointedSet<int>(SZ),m_edge(MO(edge)){ST_AS(is_COructible_v<T,R1> 
    && is_COructible_v<int,R2> && is_invocable_v<E,T>);}TE <TY E> IN Graph<E>::Graph(CRI SZ,E edge):VirtualGraph<int,CRI,CRI,E>(SZ,MO(edge)){}TE <TY 
    T,TY Enum_T,TY Enum_T_inv,TY E> IN EnumerationGraph<T,Enum_T,Enum_T_inv,E>::EnumerationGraph(CRI SZ,Enum_T& enum_T,Enum_T_inv& enum_T_inv,E edge
    ):VirtualGraph<T,ret_t<Enum_T,int>,ret_t<Enum_T_inv,T>,E>(SZ,MO(edge)),m_enum_T(enum_T),m_enum_T_inv(enum_T_inv){}TE <SFINAE_FOR_GRAPH> IN 
    MemorisationGraph<T,E,PTR>::MemorisationGraph(CRI SZ,E edge):VirtualGraph<T,T,CRI,E>(SZ,MO(edge)),m_LE(),m_memory(),m_memory_inv(){}TE <TY T,TY 
    R1,TY R2,TY E> IN E& VirtualGraph<T,R1,R2,E>::edge()NE{RE m_edge;}TE <TY T,TY R1,TY R2,TY E> IN ret_t<E,T> VirtualGraph<T,R1,R2,E>::Edge(CO T& t
    ){RE m_edge(t);}TE <TY E> IN CRI Graph<E>::Enumeration(CRI i){RE i;}TE <TY T,TY Enum_T,TY Enum_T_inv,TY E> IN ret_t<Enum_T,int> EnumerationGraph
    <T,Enum_T,Enum_T_inv,E>::Enumeration(CRI i){RE m_enum_T(i);}TE <SFINAE_FOR_GRAPH> IN T MemorisationGraph<T,E,PTR>::Enumeration(CRI i){AS(0 <= i 
    && i < m_LE);RE m_memory[i];}TE <TY E> IN CRI Graph<E>::Enumeration_inv(CRI i){RE i;}TE <TY T,TY Enum_T,TY Enum_T_inv,TY E> IN ret_t<Enum_T_inv
    ,T> EnumerationGraph<T,Enum_T,Enum_T_inv,E>::Enumeration_inv(CO T& t){RE m_enum_T_inv(t);}TE <SFINAE_FOR_GRAPH> IN CRI MemorisationGraph<T,E,PTR
    >::Enumeration_inv(CO T& t){if(m_memory_inv.count(t)== 0){AS(m_LE < TH->SZ());m_memory.push_back(t);RE m_memory_inv[t]= m_LE++;}RE 
    m_memory_inv[t];}TE <TY T,TY R1,TY R2,TY E> VO VirtualGraph<T,R1,R2,E>::Reset(){}TE <SFINAE_FOR_GRAPH> IN VO MemorisationGraph<T,E,PTR>::Reset
    (){m_LE = 0;m_memory.clear();m_memory_inv.clear();}TE <TY E> TE <TY F> IN Graph<F> Graph<E>::GetGraph(F edge)CO{RE Graph<F>(TH->SZ(),MO(edge
    ));}TE <TY T,TY Enum_T,TY Enum_T_inv,TY E> TE <TY F> IN EnumerationGraph<T,Enum_T,Enum_T_inv,F> EnumerationGraph<T,Enum_T,Enum_T_inv,E
    >::GetGraph(F edge)CO{RE EnumerationGraph(TH->SZ(),m_enum_T,m_enum_T_inv,MO(edge));}TE <SFINAE_FOR_GRAPH> TE <TY F> IN MemorisationGraph<T,F> 
    MemorisationGraph<T,E,PTR>::GetGraph(F edge)CO{RE MemorisationGraph(TH->SZ(),MO(edge));}
// AAA 常設ライブラリは以上に挿入する。
#define INCLUDE_LIBRARY
#include __FILE__
#endif // INCLUDE_LIBRARY
#endif // INCLUDE_SUB
#endif // INCLUDE_MAIN
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
0