摘要： 参考：https://www.cnblogs.com/grandyang/p/6804753.html 注意：复习容器的定义方法？？ 阅读全文

摘要： 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 makes sum of 阅读全文