1110. Delete Nodes And Return Forest

https://leetcode.com/problems/delete-nodes-and-return-forest

Description

Given the root of a binary tree, each node in the tree has a distinct value.

After deleting all nodes with a value in to_delete, we are left with a forest (a disjoint union of trees).

Return the roots of the trees in the remaining forest. You may return the result in any order.

Example 1:

**Input:** root = [1,2,3,4,5,6,7], to\_delete = [3,5]
**Output:** [[1,2,null,4],[6],[7]]

Example 2:

**Input:** root = [1,2,4,null,3], to\_delete = [3]
**Output:** [[1,2,4]]

Constraints:

• The number of nodes in the given tree is at most 1000.

• Each node has a distinct value between 1 and 1000.

• to_delete.length <= 1000

• to_delete contains distinct values between 1 and 1000.

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