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Binary Tree Zigzag Level Order Traversal
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Input
Example 1
Example 2
Four Levels
Single Node
Empty Tree
Custom
tree
=
[3, 9, 20, null, null, 15, 7]
3
9
20
15
7
L0
L1
L2
queue
level
result
level order, alternating direction
algo
master
.
io
Step:
Start: zigzag level order traversal with BFS
0 / 22
Input
Example 1
Example 2
Four Levels
Single Node
Empty Tree
Custom
tree
=
[3, 9, 20, null, null, 15, 7]
0 / 22
3
9
20
15
7
L0
L1
L2
queue
level
result
level order, alternating direction
algo
master
.
io
Step:
Start: zigzag level order traversal with BFS
