曾经的县城“黄金地段”（图：南方人物周刊记者 刘璐明）
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）。。Line官方版本下载是该领域的重要参考
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└─ AF_UNIX SEQPACKET ─→ Launcher，推荐阅读爱思助手下载最新版本获取更多信息