摘要：
Given a text file file.txt that contains list of phone numbers (one per line), write a one liner bash script to print all valid phone numbers. You may 阅读全文
摘要：
You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the quality c 阅读全文
摘要：
Description: Count the number of prime numbers less than a non-negative number, n. 使用sieve of Eratosthenes方法对质数进行筛选。 题目要求就是写出这个算法。 原理是：给出要筛数值的范围n，找出出以 阅读全文