数据显示，在去年4月中国实施出口管制后的八个月内，中国对美出口的钇类产品仅17吨，而此前八个月相关出口量为333吨，降幅极为显著。
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，更多细节参见同城约会
* 核心逻辑：能看到的人数 = 弹出的矮个子数量（count） + （栈顶有更高的人则+1，否则+0）
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