摘要：
Description In a array of size , there are unique elements, and exactly one of these elements is repeated N times. Return the element repeated times. 阅读全文
摘要：
Description Given an array of integers sorted in non decreasing order, return an array of the squares of each number, also in sorted non decreasing or 阅读全文
摘要：
Description Given an array of 2n integers, your task is to group these integers into n pairs of integer, say (a1, b1), (a2, b2), ..., (an, bn) which m 阅读全文