95. Unique Binary Search Trees II

LeetCodeDynamic ProgrammingBacktrackingTreeBinary Search TreeBinary TreeOpen on judge ↗

Given an integer n, return all the structurally unique BST's (binary search trees), which has exactly n nodes of unique values from 1 to n. Return the answer in any order. Example 1: Input: n = 3 Output: [[1,null,2,null,3],[1,null,3,2],[2,1,3],[3,1,null,null,2],[3,2,null,1]] Example 2: Input: n = 1 Output: [[1]] Constraints: - 1 <= n <= 8

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solution.cppC++17

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