摘要： 题目： Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). For example:Given binary tre 阅读全文

摘要： 题目： Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree is symmetric: 1 / \ 2 阅读全文

摘要： 题目： 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 identic 阅读全文