摘要：
题目： Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would hav 阅读全文
摘要：
题目： Given an unsorted array of integers, find the length of the longest consecutive elements sequence. For example,Given [100, 4, 200, 1, 3, 2],The lo 阅读全文