[Leetcode] 0100. Same Tree

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内容目录

Easy

Given the roots of two binary trees p and q, write a function to check if they are the same or not.

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

Example 1:

Input: p = [1,2,3], q = [1,2,3]
Output: true

Example 2:

Input: p = [1,2], q = [1,null,2]
Output: false

Example 3:

Input: p = [1,2,1], q = [1,1,2]
Output: false

Constraints:

The number of nodes in both trees is in the range [0, 100].
-10 ⁴ <= Node.val <= 10 ⁴

Python

				
					# time complexity: O(n) # space complexity: O(n) from typing import Optional class TreeNode: def __init__(self, val=0, left=None, right=None): self.val = val self.left = left self.right = right class Solution: def isSameTree(self, p: Optional[TreeNode], q: Optional[TreeNode]) -> bool: if p == None and q == None: return True if p == None or q == None: return False if p.val != q.val: return False return self.isSameTree(p.left, q.left) and self.isSameTree(p.right, q.right) p = TreeNode(1) p.left = TreeNode(2) p.right = TreeNode(2) q = TreeNode(1) q.left = TreeNode(2) q.right = TreeNode(2) print(Solution().isSameTree(p, q))

Easy

Python

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