104. 二叉树的最大深度

2024-01-09 21:48:32
# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def maxDepth(self, root: Optional[TreeNode]) -> int:
        if not root:
            return 0
        
        queue = collections.deque([root])
        depth = 0
        while queue:
            level_size = len(queue)
            depth += 1
            for _ in range(level_size):
                node = queue.popleft()
                if node.left:
                    queue.append(node.left)
                if node.right:
                    queue.append(node.right)
        return depth

文章来源:https://blog.csdn.net/weixin_42396719/article/details/135489802
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