You are given a positive number n. Return the smallest number x greater than or equal to n, such that the binary representation of x contains only set bits   Example 1: Input: n = 5 Output: 7 Explanation: The binary representation of 7 is "111". Example 2:…

给你一个整数 n，你需要重复执行多次下述操作将其转换为 0 ：

Given an integer n, you must transform it into 0 using the following operations any number of times:

给你一个字符串 s ，返回 s 中 长度为 3 的不同回文子序列 的个数。 即便存在多种方法来构建相同的子序列，但相同的子序列只计数一次。 回文 是正着读和反着读一样的字符串。 子序列 是由原字符串删除其中部分字符（也可以不删除）且不改变剩余字符之间相对顺序形成的一个新字符串。

Given a string s, return the number of unique palindromes of length three that are a subsequence of s. Note that even if there are multiple ways to obtain the same subsequence, it is still only counted once. A palindrome is a string that reads the same forwards…

给定一个二进制数组 nums ( 索引从0开始 )。 我们将xi 定义为其二进制表示形式为子数组 nums[0..i] (从最高有效位到最低有效位)。

You are given a binary array nums (0-indexed). We define xi as the number whose binary representation is the subarray nums[0..i] (from most-significant-bit to least-significant-bit).