Buggy python submission (verdict: Runtime Error):
class Node:
  key = None
  left = None
  right = None
  def __init__(self, k):
    self.key = k

class BST:
  root = None
  def insert(self, k):
    x = self.root
    y = None
    z = Node(k)
    while x is not None:
      y = x
      if z.key < y.key:
        x = x.left
      elif y.key < z.key:
        x = x.right
    
    if y is None:
      # 初回値
      self.root = z
    else:
      if z.key < y.key:
        y.left = z
      elif y.key < z.key:
        y.right = z
        
  def inorder(self):
    # 中間巡回順で出力
    # 単純にソートでいいのでは
    return sorted(self.preorder())
    
  def preorder(self):
    # 先行巡回順で出力
    res = []
    cur_node = self.root
    right_successor = []
    left_successor = []
    # 現在の木がなにもない場合
    if cur_node is None:
      return res
    # そうでない場合
    while cur_node is not None:
      res.append(cur_node.key)
      # 次に調べるやつを追加する
      if cur_node.left is not None:
        left_successor.append(cur_node.left)
      if cur_node.right is not None:
        right_successor.append(cur_node.right)
      # 次に調べるやつを左、右の順でやっていく
      cur_node = left_successor.pop() if len(left_successor) > 0 else right_successor.pop() if len(right_successor) else None
    return res
n = int(input())
bst = BST()
for _ in range(n):
  query = [int(x) if x.isnumeric() else x for x in input().split()]
  if query[0] == 'insert':
    bst.insert(query[1])
  elif query[0] == 'print':
    ans = bst.inorder()
    print(" " + " ".join(list(map(str, ans))))
    ans = bst.preorder()
    print(" " + " ".join(list(map(str, ans))))


Fixed submission:
class Node:
  key = None
  left = None
  right = None
  def __init__(self, k):
    self.key = k

class BST:
  root = None
  def insert(self, k):
    x = self.root
    y = None
    z = Node(k)
    while x is not None:
      y = x
      if z.key < y.key:
        x = x.left
      elif y.key < z.key:
        x = x.right
    
    if y is None:
      # 初回値
      self.root = z
    else:
      if z.key < y.key:
        y.left = z
      elif y.key < z.key:
        y.right = z

  def inorder(self, r, lis):
    # 中間巡回順で出力
    if r != None:
      self.inorder(r.left, lis)
      lis.append(r.key)
      self.inorder(r.right, lis)


  def preorder(self, r, lis):
    # 先行巡回順で出力
    if r != None:
      lis.append(r.key)
      self.preorder(r.left, lis)
      self.preorder(r.right, lis)

    
n = int(input())
bst = BST()
for _ in range(n):
  # query = [int(x) if re.match('[+|-]?\d', x) else x for x in input().split()]
  query = input().split()
  if query[0] == 'insert':
    bst.insert(int(query[1]))
  elif query[0] == 'print':
    root = bst.root
    in_lis = []
    pre_lis = []
    bst.preorder(root, pre_lis)
    bst.inorder(root, in_lis)
    print(" " + " ".join(list(map(str, in_lis))))
    print(" " + " ".join(list(map(str, pre_lis))))

Buggy python submission (verdict: Time Limit Exceeded):
import re

class Node:
  key = None
  left = None
  right = None
  def __init__(self, k):
    self.key = k

class BST:
  root = None
  def insert(self, k):
    x = self.root
    y = None
    z = Node(k)
    while x is not None:
      y = x
      if z.key < y.key:
        x = x.left
      elif y.key < z.key:
        x = x.right
    
    if y is None:
      # 初回値
      self.root = z
    else:
      if z.key < y.key:
        y.left = z
      elif y.key < z.key:
        y.right = z
        
  def inorder(self):
    # 中間巡回順で出力
    # 単純にソートでいいのでは
    return sorted(self.preorder())
    
  def preorder(self):
    # 先行巡回順で出力
    res = []
    cur_node = self.root
    right_successor = []
    left_successor = []
    # 現在の木がなにもない場合
    if cur_node is None:
      return res
    # そうでない場合
    while cur_node is not None:
      res.append(cur_node.key)
      # 次に調べるやつを追加する
      if cur_node.left is not None:
        left_successor.append(cur_node.left)
      if cur_node.right is not None:
        right_successor.append(cur_node.right)
      # 次に調べるやつを左、右の順でやっていく
      cur_node = left_successor.pop() if len(left_successor) > 0 else right_successor.pop() if len(right_successor) else None
    return res
n = int(input())
bst = BST()
for _ in range(n):
  query = [int(x) if re.match('[+|-]?\d', x) else x for x in input().split()]
  if query[0] == 'insert':
    bst.insert(query[1])
  elif query[0] == 'print':
    ans = bst.inorder()
    print(" " + " ".join(list(map(str, ans))))
    ans = bst.preorder()
    print(" " + " ".join(list(map(str, ans))))


Fixed submission:
class Node:
  key = None
  left = None
  right = None
  def __init__(self, k):
    self.key = k

class BST:
  root = None
  def insert(self, k):
    x = self.root
    y = None
    z = Node(k)
    while x is not None:
      y = x
      if z.key < y.key:
        x = x.left
      elif y.key < z.key:
        x = x.right
    
    if y is None:
      # 初回値
      self.root = z
    else:
      if z.key < y.key:
        y.left = z
      elif y.key < z.key:
        y.right = z

  def inorder(self, r, lis):
    # 中間巡回順で出力
    if r != None:
      self.inorder(r.left, lis)
      lis.append(r.key)
      self.inorder(r.right, lis)


  def preorder(self, r, lis):
    # 先行巡回順で出力
    if r != None:
      lis.append(r.key)
      self.preorder(r.left, lis)
      self.preorder(r.right, lis)

    
n = int(input())
bst = BST()
for _ in range(n):
  # query = [int(x) if re.match('[+|-]?\d', x) else x for x in input().split()]
  query = input().split()
  if query[0] == 'insert':
    bst.insert(int(query[1]))
  elif query[0] == 'print':
    root = bst.root
    in_lis = []
    pre_lis = []
    bst.preorder(root, pre_lis)
    bst.inorder(root, in_lis)
    print(" " + " ".join(list(map(str, in_lis))))
    print(" " + " ".join(list(map(str, pre_lis))))

Buggy python submission (verdict: Time Limit Exceeded):
import re

class Node:
  key = None
  left = None
  right = None
  def __init__(self, k):
    self.key = k

class BST:
  root = None
  def insert(self, k):
    x = self.root
    y = None
    z = Node(k)
    while x is not None:
      y = x
      if z.key < y.key:
        x = x.left
      elif y.key < z.key:
        x = x.right
    
    if y is None:
      # 初回値
      self.root = z
    else:
      if z.key < y.key:
        y.left = z
      elif y.key < z.key:
        y.right = z
        
  def inorder(self, r):
    # 中間巡回順で出力
    if r != None:
      self.inorder(r.left)
      print(" {}".format(r.key), end="")
      self.inorder(r.right)
      

  def preorder(self, r):
    # 先行巡回順で出力
    if r != None:
      print(" {}".format(r.key), end="")
      self.preorder(r.left)
      self.preorder(r.right)

    
n = int(input())
bst = BST()
for _ in range(n):
  query = [int(x) if re.match('[+|-]?\d', x) else x for x in input().split()]
  if query[0] == 'insert':
    bst.insert(query[1])
  elif query[0] == 'print':
    root = bst.root
    bst.inorder(root)
    print()
    bst.preorder(root)
    print()


Fixed submission:
class Node:
  key = None
  left = None
  right = None
  def __init__(self, k):
    self.key = k

class BST:
  root = None
  def insert(self, k):
    x = self.root
    y = None
    z = Node(k)
    while x is not None:
      y = x
      if z.key < y.key:
        x = x.left
      elif y.key < z.key:
        x = x.right
    
    if y is None:
      # 初回値
      self.root = z
    else:
      if z.key < y.key:
        y.left = z
      elif y.key < z.key:
        y.right = z

  def inorder(self, r, lis):
    # 中間巡回順で出力
    if r != None:
      self.inorder(r.left, lis)
      lis.append(r.key)
      self.inorder(r.right, lis)


  def preorder(self, r, lis):
    # 先行巡回順で出力
    if r != None:
      lis.append(r.key)
      self.preorder(r.left, lis)
      self.preorder(r.right, lis)

    
n = int(input())
bst = BST()
for _ in range(n):
  # query = [int(x) if re.match('[+|-]?\d', x) else x for x in input().split()]
  query = input().split()
  if query[0] == 'insert':
    bst.insert(int(query[1]))
  elif query[0] == 'print':
    root = bst.root
    in_lis = []
    pre_lis = []
    bst.preorder(root, pre_lis)
    bst.inorder(root, in_lis)
    print(" " + " ".join(list(map(str, in_lis))))
    print(" " + " ".join(list(map(str, pre_lis))))

Buggy python submission (verdict: Runtime Error):
import re

class Node:
  key = None
  left = None
  right = None
  def __init__(self, k):
    self.key = k

class BST:
  root = None
  def insert(self, k):
    x = self.root
    y = None
    z = Node(k)
    while x is not None:
      y = x
      if z.key < y.key:
        x = x.left
      elif y.key < z.key:
        x = x.right
    
    if y is None:
      # 初回値
      self.root = z
    else:
      if z.key < y.key:
        y.left = z
      elif y.key < z.key:
        y.right = z
        
  def inorder(self, r):
    # 中間巡回順で出力
    if r != None:
      self.inorder(r.left)
      print(" {}".format(r.key), end="")
      self.inorder(r.right)
      

  def preorder(self, r):
    # 先行巡回順で出力
    if r != None:
      print(" {}".format(r.key), end="")
      self.preorder(r.left)
      self.preorder(r.right)

    
n = int(input())
bst = BST()
for _ in range(n):
  # query = [int(x) if re.match('[+|-]?\d', x) else x for x in input().split()]
  if query[0] == 'insert':
    bst.insert(int(query[1]))
  elif query[0] == 'print':
    root = bst.root
    bst.inorder(root)
    print()
    bst.preorder(root)
    print()


Fixed submission:
class Node:
  key = None
  left = None
  right = None
  def __init__(self, k):
    self.key = k

class BST:
  root = None
  def insert(self, k):
    x = self.root
    y = None
    z = Node(k)
    while x is not None:
      y = x
      if z.key < y.key:
        x = x.left
      elif y.key < z.key:
        x = x.right
    
    if y is None:
      # 初回値
      self.root = z
    else:
      if z.key < y.key:
        y.left = z
      elif y.key < z.key:
        y.right = z

  def inorder(self, r, lis):
    # 中間巡回順で出力
    if r != None:
      self.inorder(r.left, lis)
      lis.append(r.key)
      self.inorder(r.right, lis)


  def preorder(self, r, lis):
    # 先行巡回順で出力
    if r != None:
      lis.append(r.key)
      self.preorder(r.left, lis)
      self.preorder(r.right, lis)

    
n = int(input())
bst = BST()
for _ in range(n):
  # query = [int(x) if re.match('[+|-]?\d', x) else x for x in input().split()]
  query = input().split()
  if query[0] == 'insert':
    bst.insert(int(query[1]))
  elif query[0] == 'print':
    root = bst.root
    in_lis = []
    pre_lis = []
    bst.preorder(root, pre_lis)
    bst.inorder(root, in_lis)
    print(" " + " ".join(list(map(str, in_lis))))
    print(" " + " ".join(list(map(str, pre_lis))))

Buggy python submission (verdict: Time Limit Exceeded):
import re

class Node:
  key = None
  left = None
  right = None
  def __init__(self, k):
    self.key = k

class BST:
  root = None
  def insert(self, k):
    x = self.root
    y = None
    z = Node(k)
    while x is not None:
      y = x
      if z.key < y.key:
        x = x.left
      elif y.key < z.key:
        x = x.right
    
    if y is None:
      # 初回値
      self.root = z
    else:
      if z.key < y.key:
        y.left = z
      elif y.key < z.key:
        y.right = z
        
  def inorder(self, r):
    # 中間巡回順で出力
    if r != None:
      self.inorder(r.left)
      print(" {}".format(r.key), end="")
      self.inorder(r.right)
      

  def preorder(self, r):
    # 先行巡回順で出力
    if r != None:
      print(" {}".format(r.key), end="")
      self.preorder(r.left)
      self.preorder(r.right)

    
n = int(input())
bst = BST()
for _ in range(n):
  # query = [int(x) if re.match('[+|-]?\d', x) else x for x in input().split()]
  query = input().split()
  if query[0] == 'insert':
    bst.insert(int(query[1]))
  elif query[0] == 'print':
    root = bst.root
    bst.inorder(root)
    print()
    bst.preorder(root)
    print()


Fixed submission:
class Node:
  key = None
  left = None
  right = None
  def __init__(self, k):
    self.key = k

class BST:
  root = None
  def insert(self, k):
    x = self.root
    y = None
    z = Node(k)
    while x is not None:
      y = x
      if z.key < y.key:
        x = x.left
      elif y.key < z.key:
        x = x.right
    
    if y is None:
      # 初回値
      self.root = z
    else:
      if z.key < y.key:
        y.left = z
      elif y.key < z.key:
        y.right = z

  def inorder(self, r, lis):
    # 中間巡回順で出力
    if r != None:
      self.inorder(r.left, lis)
      lis.append(r.key)
      self.inorder(r.right, lis)


  def preorder(self, r, lis):
    # 先行巡回順で出力
    if r != None:
      lis.append(r.key)
      self.preorder(r.left, lis)
      self.preorder(r.right, lis)

    
n = int(input())
bst = BST()
for _ in range(n):
  # query = [int(x) if re.match('[+|-]?\d', x) else x for x in input().split()]
  query = input().split()
  if query[0] == 'insert':
    bst.insert(int(query[1]))
  elif query[0] == 'print':
    root = bst.root
    in_lis = []
    pre_lis = []
    bst.preorder(root, pre_lis)
    bst.inorder(root, in_lis)
    print(" " + " ".join(list(map(str, in_lis))))
    print(" " + " ".join(list(map(str, pre_lis))))