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Check whether you already have access via your university or organisation.，推荐阅读旺商聊官方下载获取更多信息
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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）。
（三）国务院财政、税务主管部门规定的其他情形。，这一点在雷电模拟器官方版本下载中也有详细论述