static int Max_Xor ( int arr [ ] , int i , int j , int mask , int n ) {
  if ( i >= n ) {
    if ( j == 0 ) return mask ;
    else return 0 ;
  }
  if ( dp [ i ] [ j ] [ mask ] != - 1 ) return dp [ i ] [ j ] [ mask ] ;
  int ans = 0 ;
  if ( j > 0 ) ans = Max_Xor ( arr , i + 1 , j - 1 , mask ^ arr [ i ] , n ) ;
  ans = Math . max ( ans , Max_Xor ( arr , i + 1 , j , mask , n ) ) ;
  return dp [ i ] [ j ] [ mask ] = ans ;
}

static int Max_Xor ( int arr [ ] , int i , int j , int mask , int n ) { if ( i >= n ) { if ( j == 0 ) return mask ; else return 0 ; } if ( dp [ i ] [ j ] [ mask ] != - 1 ) return dp [ i ] [ j ] [ mask ] ; int ans = 0 ; if ( j > 0 ) ans = Max_Xor ( arr , i + 1 , j - 1 , mask ^ arr [ i ] , n ) ; ans = Math . max ( ans , Max_Xor ( arr , i + 1 , j , mask , n ) ) ; return dp [ i ] [ j ] [ mask ] = ans ; }
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