Category: programming languages

Simplify an absolute path for a file (Unix-style): For example, path = "/home/", => "/home" path = "/a/./b/../../c/", => "/c" Did you consider the case where path = “/../”? …

We have talked about the Pre-order in this post, and In-order Traversal for binary tree in this post. And this article talks about the third kind: Postorder traversal, which …

Remove the nth node from the end of a singly linked list and return its head. For example, input: 1-2-3-4-5, and n = 2. Removing the second node from …

Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-negative integers, +, -, *, / operators and empty spaces . The integer division …

Given a binary tree, return the level order traversal of its nodes’ values. (ie, from left to right, level by level). For example: 3 / \ 9 20 / …