0894. All Possible Full Binary Trees

https://leetcode.com/problems/all-possible-full-binary-trees

Description

Given an integer n, return a list of all possible full binary trees with n nodes. Each node of each tree in the answer must have Node.val == 0.

Each element of the answer is the root node of one possible tree. You may return the final list of trees in any order.

A full binary tree is a binary tree where each node has exactly 0 or 2 children.

Example 1:

**Input:** n = 7
**Output:** [[0,0,0,null,null,0,0,null,null,0,0],[0,0,0,null,null,0,0,0,0],[0,0,0,0,0,0,0],[0,0,0,0,0,null,null,null,null,0,0],[0,0,0,0,0,null,null,0,0]]

Example 2:

**Input:** n = 3
**Output:** [[0,0,0]]

Constraints:

• 1 <= n <= 20

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