leetcode_gym/_problems/isSymmetricTree.md

layout, title

layout	title
page	Is Tree Symmetric?

{% highlight python %}

class TreeNode:

def __init__(self, val):

    self.val = val
    self.left = None
    self.right = None

def isSymmetric(root):

def isMirror(left, right):
    
    if not left and not right:
        return True

    if left and not right:
        return False

    if right and not left:
        return False

    if left and right and left.val == right.val:
        return isMirror(left.left, right.right) and isMirror(left.right, right.left)

    return False

if not root:
    return True

return isMirror(root.left, root.right)

root = TreeNode(0) root.left = TreeNode(2) root.right = TreeNode(2) root.left.left = TreeNode(3) root.right.right = TreeNode(3)

print(isSymmetric(root))

{% endhighlight %}