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100.py
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36 lines (30 loc) · 938 Bytes
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'''
100. Same Tree
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.
'''
# Definition for a binary tree node.
# class TreeNode(object):
# def __init__(self, x):
# self.val = x
# self.left = None
# self.right = None
class Solution(object):
def isSameTree(self, p, q):
"""
:type p: TreeNode
:type q: TreeNode
:rtype: bool
"""
if not p and not q:
return True
if not (p and q):
return False
# leaves
if not p.left and not p.right and not q.left and not q.right:
if p.val == q.val:
return True
else:
return False
return p.val == q.val and self.isSameTree(p.left, q.left) and self.isSameTree(p.right, q.right)