Given a binary tree, collect a tree's nodes as if you were doing this: Collect and remove all leaves, repeat until the tree is empty.
Example:
Given binary tree
1 / \ 2 3 / \ 4 5
Returns [4, 5, 3], [2], [1]
.
Explanation:
1. Removing the leaves [4, 5, 3]
would result in this tree:
1 / 2
2. Now removing the leaf [2]
would result in this tree:
1
3. Now removing the leaf [1]
would result in the empty tree:
[]
Returns [4, 5, 3], [2], [1]
.
Credits:
Special thanks to @elmirap for adding this problem and creating all test cases.