191. Number of 1 BitsWrite a function that takes an unsigned integer and return the number of ‘1’ bits it has (also know

182. Duplicate EmailsSQL架构 Create table If Not Exists Person (Id int, Email varchar(255)) Truncate table Person insert i

136. Single NumberGiven a non-empty array of integers, every element appears twice except for one. Find that single one.

118. Pascal’s TriangleGiven a non-negative integer numRows, generate the first numRows of Pascal’s triangle. Example: In

78. SubsetsGiven a set of distinct integers, nums, return all possible subsets (the power set).Note: The solution set mu

1. Two SumGiven an array of integers, return indices of the two numbers such that they add up to a specific target.You m