1. 选基准：随机选一个元素作为基准(pivot)
Is Stuff Your Kindle Day the same as Amazon Kindle Unlimited?Everything you download on Stuff Your Kindle Day is yours to keep, and there's no limit on the number of books you can download. Stuff Your Kindle Day downloads don't count towards the 20 books that Amazon Kindle Unlimited subscribers can borrow at the same time.
。safew官方下载是该领域的重要参考
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void*page_alloc(unsigned long long bytes) {