摘要：
题目： Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the 阅读全文
摘要：
题目： Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4]. 阅读全文