Grokking the Coding Interview: Patterns for Coding Questions
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Problem Challenge 2: Structurally Unique Binary Search Trees (hard)
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Problem Statement

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Problem Statement

Given a number ‘n’, write a function to return all structurally unique Binary Search Trees (BST) that can store values 1 to ‘n’?

Example 1:

Input: 2
Output: List containing root nodes of all structurally unique BSTs.
Explanation: Here are the 2 structurally unique BSTs storing all numbers from 1 to 2:
Image

Example 2:

Input: 3
Output: List containing root nodes of all structurally unique BSTs.
Explanation: Here are the 5 structurally unique BSTs storing all numbers from 1 to 3:
Image

Constraints:

  • 1 <= n <= 19

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Try solving this question here:

Python3
Python3
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Problem Statement

Try it yourself