A new transaction is added to the system. It is then relayed to a network of computers located around the world. The computers then solve equations to ensure the authenticity of the transaction.
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Author(s): Oliver A. Dicks, Solveig S. Aamlid, Alannah M. Hallas, Joerg Rottler，推荐阅读夫子获取更多信息
// 易错点2：遍历结束后k仍0 → 栈是递增的，末尾数字更大，移除末尾k位