# Definition for a binary tree node
class TreeNode:
def __init__(self, x):
self.val = x
self.left = None
self.right = None
class Solution:
# @param root, a tree node
# @return a list of lists of integers
def zigzagLevelOrder(self, root):
if root is None:
return []
result, current, level = [], [root], 1
while current:
next_level, vals = [], []
for node in current:
vals.append(node.val)
if node.left:
next_level.append(node.left)
if node.right:
next_level.append(node.right)
if level % 2:
result.append(vals)
else:
result.append(vals[::-1])
level += 1
current = next_level
return result
103. Binary Tree Zigzag Level Order Traversal
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