摘要： 问题描述： Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally 阅读全文

摘要： 问题描述： Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree [1,2,2,3,4,4,3] is 阅读全文