flatten_binary_tree_to_linked_list

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114. Flatten Binary Tree to Linked List (Medium)

Given a binary tree, flatten it to a linked list in-place.

For example, given the following tree:

    1
   / \
  2   5
 / \   \
3   4   6

The flattened tree should look like:

1
 \
  2
   \
    3
     \
      4
       \
        5
         \
          6

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Similar Questions

1. Flatten a Multilevel Doubly Linked List (Medium)

Hints

Hint 1

If you notice carefully in the flattened tree, each node's right child points to the next node of a pre-order traversal.