[Solved] Consider all the leaves of a binary tree, from left to right order, the values of those leaves form a leaf value sequence.

Question

Consider all the leaves of a binary tree, from left to right order, the values of those leaves form a leaf value sequence.

For example, in the given tree above, the leaf value sequence is (6, 7, 4, 9, 8).

Two binary trees are considered leaf-similar if their leaf value sequence is the same.

Return true if and only if the two given trees with head nodes root1 and root2 are leaf-similar.

Example 1:

Input: root1 = [3,5,1,6,2,9,8,null,null,7,4], root2 = [3,5,1,6,7,4,2,null,null,null,null,null,null,9,8]
Output: true

Example 2:

Input: root1 = [1,2,3], root2 = [1,3,2]
Output: false

Constraints:

• The number of nodes in each tree will be in the range [1, 200].
• Both of the given trees will have values in the range [0, 200].

Python Solution

# 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 make_list(self,root,l):
        if root == None:
            return 
        self.make_list(root.left,l)
        if root.left==None and root.right==None:
            l.append(root.val)
        self.make_list(root.right,l)
    
    def leafSimilar(self, root1: TreeNode, root2: TreeNode) -> bool:
        
        
        l1 = []
        l2 = []
        self.make_list(root1,l1)
        self.make_list(root2,l2)

        return l1==l2