Subtree of Another Tree

class Solution:
    def isSubtree(
        self, root: TreeNode | None, subRoot: TreeNode | None
    ) -> bool:
        if not subRoot:
            return True
        if not root:
            return False
        if self.isSameTree(root, subRoot):
            return True
        return self.isSubtree(root.left, subRoot) or self.isSubtree(
            root.right, subRoot
        )

    def isSameTree(
        self, p: TreeNode | None, q: TreeNode | None
    ) -> bool:
        if not p and not q:
            return True
        if not p or not q or p.val != q.val:
            return False
        return self.isSameTree(p.left, q.left) and self.isSameTree(
            p.right, q.right
        )