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[leetcode] 100. Same Tree题目链接：https://leetcode.com/problems/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 struct

[leetcode] 101. Symmetric Tree题目链接：https://leetcode.com/problems/symmetric-tree/Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center).For example, this binary tr