摘要： Description： Given an array of integers, every element appears three times except for one. Find that single one.只有一个出现一次的数字，其他的都出现了3次，找出出现一次的那个数字。pub... 阅读全文

摘要： Description：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",... 阅读全文