曾经写过一篇文章《批量获取文件名称及路径，用Power Query多简单！》，里面介绍了通过Power Query实现对文件夹及路径管理的问题，但对比我们常见的文件夹内容，PQ里获取的信息总好像少了点儿啥！...

Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered from top to bottom.

Given a binary tree, return the preorder traversal of its nodes’ values.

Given a binary tree, return the postorder traversal of its nodes’ values.

Given a binary search tree, write a function kthSmallest to find the kth smallest element in it.

This problem was inspired by this original tweet by Max Howell:

Given a 2D binary matrix filled with 0’s and 1’s, find the largest square containing only 1’s and return its area.

Given a 2D binary matrix filled with 0’s and 1’s, find the largest square containing only 1’s and return its area.

Given a binary tree, return all root-to-leaf paths.

Given a string that contains only digits 0-9 and a target value, return all possibilities to add binary operators (not unary) +, -, or * between the digits so t...