Leetcode: Same Tree

Question

Given two binary trees, write a function to check if they are equal or not.

Two binary trees are considered equal if they are structurally identical and the nodes have the same value.

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Analysis

It is similar as Symmetric Tree.

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Solution

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, x):
#         self.val = x
#         self.left = None
#         self.right = None

class Solution:
    # @param {TreeNode} p
    # @param {TreeNode} q
    # @return {boolean}
    def isSameTree(self, p, q):
        return self.helper(p,q)

    def helper(self,root1,root2):
        if root1==None and root2==None:
            return True

        if root1==None or root2==None:
            return False

        if root1.val!=root2.val:
            return False

        return self.helper(root1.left,root2.left) and self.helper(root1.right, root2.right)