数组 array在 Rust 中，数组是一种固定大小的数据结构，用于存储具有相同数据类型的元素的有序集合。“固定大小”是指数组中的元素的类型和数量确定，也就确定了整数数组的大小。声明数组可以在声明时指定长度，声明语法：[T; N]，T为数组中元素的类型，N为元素的个数。这两个类型参数在编译时就必须确定下来，数组长度是固定的、不可变的。数组中的元素可以通过索引来访问和修改，索引从 0 开始，最大值....

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