摘要： 题目描述： Given a sorted integer array without duplicates, return the summary of its ranges. For example, given [0,1,2,4,5,7], return ["0->2","4->5","7"]. 阅读全文

摘要： 题目描述： Description: Count the number of prime numbers less than a non-negative number, n. 解题思路： Let's start with a isPrime function. To determine if a 阅读全文