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In computer science, a binary search tree (BST), also called an ordered or sorted binary tree, is a rooted binary tree data structure with the key of each internal node being greater than all the keys in the respective node's left subtree and less than the ones in its right subtree. 二叉搜索树！
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C语言的结构体有字节对齐特性，会依照所有基本类型的最大长度开辟内存空间，不能跨字节存储，首地址必须是本身长度的倍数，这样做是为了方CPU读取，是一种空间换时间的方法。
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1. Non-recursive, using an explicit stack of pointer that store the
next array partition to sort. To save time, this maximum amount
of space required to store an array of SIZE_MAX is allocated on the
stack. Assuming a 32-bit (64 bit) integer for size_t, this needs
only 32 * sizeof(stack_node) == 256 bytes (for 64 bit: 1024 bytes).
Pretty cheap, actually.
C语言的快排底层用的是栈结构，弃用递归来加速。
next array partition to sort. To save time, this maximum amount
of space required to store an array of SIZE_MAX is allocated on the
stack. Assuming a 32-bit (64 bit) integer for size_t, this needs
only 32 * sizeof(stack_node) == 256 bytes (for 64 bit: 1024 bytes).
Pretty cheap, actually.
C语言的快排底层用的是栈结构，弃用递归来加速。
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