习题链接：LeetCode 1475. 商品折扣后的最终价格
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，详情可参考heLLoword翻译官方下载
Blockchain technology provides a way of avoiding this situation by using multiple computers at different locations to store information about transactions. If one computer experiences problems with a transaction, it will not affect the other nodes.，更多细节参见雷电模拟器官方版本下载
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