摘要：
1. 题目要求 Given a non-empty list of words, return the k most frequent elements. Your answer should be sorted by frequency from highest to lowest. If two 阅读全文
摘要：
1. 题目要求 Your are given an array of integers prices, for which the i-th element is the price of a given stock on day i; and a non-negative integer fee 阅读全文