[leetcode]Same Tree @ Python

原題地址：https://oj.leetcode.com/problems/same-tree/

題意：判斷兩棵樹是否是同一棵樹。

解題思路：這題比較簡單。用遞歸來做。首先判斷兩個根節點的值是否相同，如果相同，遞歸判斷根的左右子樹。

代碼：

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

class Solution:
    # @param p, a tree node
    # @param q, a tree node
    # @return a boolean
    def isSameTree(self, p, q):
        if p == None and q == None: return True
        if p and q and p.val == q.val:
            return self.isSameTree(p.left, q.left) and self.isSameTree(p.right, q.right)
        return False