Transform backpressure gaps
// 易错点2：条件写成`<`而非`<=` → 相同身高的人会被错误保留，导致count统计少，详情可参考旺商聊官方下载
方法二：使用 KMP 的 expect/actual 机制统一处理平台差异，更多细节参见51吃瓜
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