Blockchain technology was originally invented in 1991 by two mathematicians, Stuart Haber and W. Scot Stornetta. They first proposed the system to ensure that timestamps could not be tampered with.
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定存什么：要下标/距离就栈里存索引，只要值就存值或存索引再 nums[i] 取。
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// ⚠️ 易错点3：此处返回n而非0（完全有序无需排序，长度为0）