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Flatten Nested List Iterator (M) 题目 Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer, or a list 阅读全文
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Integer Break (M) 题目 Given a positive integer n, break it into the sum of at least two positive integers and maximize the product of those integers. R 阅读全文
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Reverse Vowels of a String (E) 题目 Write a function that takes a string as input and reverse only the vowels of a string. Example 1: Input: "hello" Out 阅读全文