本程序源于一个有趣的需求，圣诞节上大家交换礼物，需要随机配对。
思路：
数列a[N]
1、随机排序
从[0~N-i-1]中找个随机数j，a[j]与a[N-i-1]交换位置
2、配对
新的数列，两两输出即可
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同学随机交换礼物的算法 OC 实现
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