leetCode周赛83 JavaScript解题报告829.Consecutive Numbers Sum 828.Unique Letter String
比赛地址https://leetcode.com/contest/weekly-contest-83830.PositionsofLargeGroupsInastringSoflowercaseletters,theselettersformconsecutivegroupsofthesamecharacter.Forexample,astringlikeS="abbxxxxzyy"hastheg