# Functions
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# Structs
https://leetcode-cn.com/problems/insert-delete-getrandom-o1/ O(1) 时间插入、删除和获取随机元素 通过把要删除元素和数组尾部元素调换,然后去掉尾部元素,实现O(1)删除.
https://leetcode-cn.com/problems/shuffle-an-array/ 打乱数组,洗牌算法.