2019-04-08から1日間の記事一覧
問題 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 symmetric: Example 1: 1 / \ 2 2 / \ / \ 3 4 4 3 Example 2: 1 / \ 2 2 \ \ 3 3 https://leetc…