CC7_01
Create a function that takes in a Binary Search Tree (BST) and a positive integer k, returning the kth largest integer value within the BST.
Assume that the BST only contains integer values and that k will always be less than or equal to the total number of nodes in the tree.
For this question, duplicate integers are treated as distinct entries. For instance, in a BST with values {5, 7, 7}, the second largest value would be 7—not 5.
Each BST node has an integer value, a left child node, and a right child node. A node is a valid BST node only if it adheres to the BST properties: its value is strictly greater than all values of nodes in its left subtree, and less than or equal to all values of nodes in its right subtree. The children nodes are either valid BST nodes themselves or None / null.

Sample input:

Sample output:
17

Given the following implementation to traverse_reverse_in_order(node, k, tree_data), which test case would fail? It is guaranteed that all the other methods are correctly implemented. The input trees depicted in the DcStrings of test cases are guaranteed to be accurate.

Question

CC7_01
Create a function that takes in a Binary Search Tree (BST) and a positive integer k, returning the kth largest integer value within the BST.
Assume that the BST only contains integer values and that k will always be less than or equal to the total number of nodes in the tree.
For this question, duplicate integers are treated as distinct entries. For instance, in a BST with values {5, 7, 7}, the second largest value would be 7—not 5.
Each BST node has an integer value, a left child node, and a right child node. A node is a valid BST node only if it adheres to the BST properties: its value is strictly greater than all values of nodes in its left subtree, and less than or equal to all values of nodes in its right subtree. The children nodes are either valid BST nodes themselves or None / null.

Sample input:

Sample output:
17

Given the following implementation to traverse_reverse_in_order(node, k, tree_data), which test case would fail? It is guaranteed that all the other methods are correctly implemented. The input trees depicted in the DcStrings of test cases are guaranteed to be accurate.

BlackTom AI · Accepted Answer

The question presents a scenario with a reverse in-order traversal-based solution for selecting the kth largest value in a BST, and asks which test case would fail given the provided implementation, with the guarantee that all other methods are correct. 
Option A: The implementation is correct and would pass both test cases. This would be true only if the reverse in-order traversal used to fetch the kth largest value correctly handles all BST invariants described in the prompt, including duplicates treated as distinct and the specific structure of the test trees. If the traversal correctly visits nodes in descending order (right subtree, node, left subtree) and decrements k appropriately until it reaches 0, then the kth visited node’s value would be the kth largest. However, the prompt states there are test cases that would fail, implying that this option would not hold under the given test suite. Therefore, Option A is likely false.
Option B: The implementation would fail both test cases. This statement claims that the reverse in-order approach as implemented has issues that cause it to fail across the provided tests. Potential failure modes could include mishandling duplicates (despite the problem treating duplicates as distinct entries), incorrect update of k (e.g., decrementing at the wrong time or not stopping exactly when k reaches zero), or mismanagement of subtree ordering due to edge cases in the traversal logic. Since the question asserts that there are test cases where the behavior is incorrect, this option aligns with the idea that the implementation has flaws affecting both scenarios described by the test inputs.
In short, thinking through how a reverse in-order traversal selects the kth largest value, the guarantee of failing tests points toward identifying a flaw in the traversal’s control of the k counter or in handling nodes with equal values. That aligns with Option B, which claims failure across both tests. The counterpoint in Option A relies on perfect correctness of the traversal, which would contradict the premise that at least one test would fail.
Therefore, Option B reasons about a plausible flaw pattern that could cause failures across multiple test cases, while Option A asserts universal correctness contrary to the given setup.

查看解析

登录即可查看完整答案

类似问题

BST_Srch3 Below is a BST When searching for Node 78 which node is visited 4th? Note that this is a BST not an AVL tree. AVL balancing is not a concern.

BST_I_18 Examine the Binary Search Tree (BST) depicted below: You are inserting a new node with the value 250 into the BST shown below. Currently, you are examining the node with the value 200. According to the standard BST insertion algorithm (no AVL balancing), what is the next step?

Consider that a BST is used to implement the Dictionary ADT. What is the best- and worst-case complexity for the operation 'add'?

If the keys inserted into a Binary Search Tree are already in descending sorted order, what is the shape of the resulting tree. Assume the tree is not self-balancing.

What is the average‑case time complexity of searching for an element in a balanced BST?

I want to generate a balanced BST from a list with numbers from 1 to 10 inclusive and apply no self-balancing. To do that, what order should I insert items in?

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单