"I felt like I was dying... the pain was worse than it had ever been," she said.
Once a transaction is confirmed, it is placed in a block after the confirmation. All of the blocks are chained together to create a permanent history of every transaction.
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Model DDoS attacks, in which AI systems are intentionally overloaded with too many prompts, can occur without proper security protocols in place. Anyone who works with AI should learn about new AI-specific attacks and work to prevent them.
思路：找「右侧第一个 ≤ cur」的元素 → 弹出所有 cur 的元素，栈顶即为折扣。最终价格 = cur - 折扣（有则）或 cur（无则）。
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