class BiTreeNode: def __init__(self, data=None): self.data = data self.l_child = None self.r_child = None class BiTree(object): def __init__(self, root=None): self.root = root def createBiTree(order, self=None): q = LinkQueue() self.l_child = None self.r_child = None root = BiTreeNode bt = BiTree(root) q.offer(root) for i in range(1, len(order)): c = order[i] node = q.peek() if node.l_child is None: newNode = BiTreeNode(c) node.l_child = newNode q.offer(newNode) elif node.r_child is None: newNode = BiTreeNode(c) node.r_child = newNode q.offer(newNode) q.poll() return bt def preOrder(root): if root is not None: print(root.data, end='') BiTree.preOrder(root.l_child) BiTree.preOrder(root.r_child) def inOrder(root): if root is not None: BiTree.inOrder(root.l_child) print(root.data, end='') BiTree.inOrder(root.r_child) def postOrder(root): if root is not None: BiTree.postOrder(root.l_child) BiTree.postOrder(root.r_child) print(root.data, end='') bt = BiTree.createBiTree('') print("先序遍历:") BiTree.preOrder(bt.root) print() print("中序遍历:") BiTree.inOrder(bt.root) print() print("后序遍历:") BiTree.postOrder(bt.root) print()这段代码有什么问题
时间: 2024-02-14 13:05:07 浏览: 25
这段代码存在以下几个问题:
1. `root = BiTreeNode`应该改为`root = BiTreeNode()`,即需要调用`BiTreeNode`类的构造函数来创建一个具体的节点对象。否则,变量`root`仅仅是一个指向`BiTreeNode`类的引用,而不是一个具体的节点对象。
2. `createBiTree(order, self=None)`方法的定义中,`self`参数是没有用的,应该删除。
3. `preOrder(root)`, `inOrder(root)`和`postOrder(root)`这三个函数的调用方式不正确,应该使用`bt.preOrder(bt.root)`等方式来调用。
下面是更新后的代码:
```python
class BiTreeNode:
def __init__(self, data=None):
self.data = data
self.l_child = None
self.r_child = None
class BiTree(object):
def __init__(self, root=None):
self.root = root
@classmethod
def createBiTree(cls, order):
q = LinkQueue()
root = BiTreeNode()
bt = BiTree(root)
q.offer(root)
for i in range(len(order)):
c = order[i]
node = q.peek()
if node.l_child is None:
newNode = BiTreeNode(c)
node.l_child = newNode
q.offer(newNode)
elif node.r_child is None:
newNode = BiTreeNode(c)
node.r_child = newNode
q.offer(newNode)
q.poll()
return bt
def preOrder(self, root):
if root is not None:
print(root.data, end='')
self.preOrder(root.l_child)
self.preOrder(root.r_child)
def inOrder(self, root):
if root is not None:
self.inOrder(root.l_child)
print(root.data, end='')
self.inOrder(root.r_child)
def postOrder(self, root):
if root is not None:
self.postOrder(root.l_child)
self.postOrder(root.r_child)
print(root.data, end='')
bt = BiTree.createBiTree('')
print("先序遍历:")
bt.preOrder(bt.root)
print()
print("中序遍历:")
bt.inOrder(bt.root)
print()
print("后序遍历:")
bt.postOrder(bt.root)
print()
```
注意,上述代码假定`LinkQueue`类已经被定义并导入到当前模块。此外,由于没有输入实际的二叉树节点值,因此代码运行结果并不有意义。