Keep walking

摘要： Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to check whether these edges mak 阅读全文

摘要： Given a sorted array, two integers k and x, find the k closest elements to x in the array. The result should also be sorted in ascending order. If the 阅读全文

摘要： Amazon Simple Queue Service (Amazon SQS) is a reliable, highly-scalable hosted queue for storing messages as they travel between applications or micro 阅读全文

摘要： Given a list of directory info including directory path, and all the files with contents in this directory, you need to find out all the groups of dup 阅读全文

摘要： Given an encoded string, return it's decoded string. The encoding rule is: k[encoded_string], where the encoded_string inside the square brackets is b 阅读全文

摘要： https://github.com/alex/what-happens-when 阅读全文

摘要： Useful system design documents/questions and answers... https://github.com/FreemanZhang/system-design https://github.com/checkcheckzz/system-design-in 阅读全文

摘要： Implement regular expression matching with support for '.' and '*'. 阅读全文

摘要： You are given several logs that each log contains a unique id and timestamp. Timestamp is a string that has the following format: Year:Month:Day:Hour: 阅读全文

摘要： Given a string, find the first non-repeating character in it and return it's index. If it doesn't exist, return -1. Examples: Note: You may assume the 阅读全文