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557. Reverse Words in a String III代码链接Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.Example 1:Input

339. Nested List Weight Sum代码链接Given a nested list of integers, return the sum of all integers in the list weighted by their depth.Each element is either an integer, or a list – whose elements may also

461.Hamming Distance代码链接between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, calculate the Hamming distance. Note:0 ≤ x, y < 231.

476. Number Complement代码链接Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation.Note:The given integer is guaranteed to fit wi

500. Keyboard Row代码链接Given a List of words, return the words that can be typed using letters of alphabet on only one row’s of American keyboard like the image below.American keyboard Example 1:Input: