B搜索树横向 [英] BInary search tree transversals

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本文介绍了B搜索树横向的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我对二进制搜索树横向的递归感到困惑,我只是迷失了,因为我需要在最后返回一个列表,不知道如何保存值。它添加如下所示的值,不要使用什么数据stype来保存像这样的值,我也不认为我正在通过树正确的这里是我的代码,不知道我的unittest是否正确

  def inorder(self):

print(IN INORDER_______________________________)
print(Printing self.value + str(self .__ value))
result = []

如果self .__ left:
print(theres self.left)
print(self。 __value)
#result = result + self .__ left
#print(result)
return self .__ left.inorder()
result
print(result +RESULTS )

如果self .__ right:

print(theres self.right)
print(self .__ value)
return s elf .__ right.inorder()

返回结果



def test_inorder(self):
bt = family_tree()
bt.add(15,jim)
bt.add(20,jamie)
bt.add(25,fred)
bt.add(35, howard)
bt.add(30,kc)
x = bt.inorder()

expected ='''(15,'jim'),( 20,'jamie'),(25,'fred'),(30,'howard'),(35,'kc')'''
self.assertEquals(str(x),expected)
t = family_tree(bt)
self.assertEquals(str(t),expected)


解决方案

您的无序执行有一个问题;您返回值而不是将它们连接在一起。



这是根据您的代码实现的:

  def inorder(self):
result = []
如果self .__ left:
result + = self .__ left.inorder()

result.append(self .__ value)

如果self .__ right:
result + = self .__ right.inorder()

return result


I am confused on the recursion in binary search tree transversals, I'm just lost since i need to return a list at the end and don't get how to save the values.It adds values like this shown below and I don't get what data stype is used to save the values like that also I don't think I'm moving through the tree correctly here is my code for , not sure if my unittest is correct either

def inorder(self):

    print("IN INORDER_______________________________")
    print("Printing self.value" + str(self.__value))
    result = []

    if self.__left:
        print("theres self.left")
        print(self.__value)
        #result = result + self.__left 
        #print(result)
        return self.__left.inorder()
        result 
        print(result + "RESULTS")

    if self.__right:

        print("theres self.right")
        print(self.__value)
        return self.__right.inorder()  

    return result



def test_inorder(self):
    bt = family_tree()
    bt.add(15, "jim")
    bt.add(20, "jamie")
    bt.add(25, "fred")
    bt.add(35, "howard")
    bt.add(30, "kc")
    x = bt.inorder()

    expected = '''(15, 'jim'),(20, 'jamie'),(25, 'fred'),(30, 'howard'),(35, 'kc')'''
    self.assertEquals(str(x), expected)
    t = family_tree(bt)
    self.assertEquals(str(t), expected)

解决方案

There is a problem in your inorder implementation ; you return the values instead of connect them together.

Here is my implementation based on your code:

def inorder(self):
    result = []
    if self.__left:
        result += self.__left.inorder()

    result.append(self.__value)

    if self.__right:
        result += self.__right.inorder()

    return result

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