* 核心功能：每次调用next(val)，返回当前价格的跨度（往回数≤当前价格的最大连续天数）
反复纠缠、强行讨要或者以其他滋扰他人的方式乞讨的，处五日以下拘留或者警告。
。关于这个话题，safew官方版本下载提供了深入分析
siftDown(arr, n, largest); // 递归下沉
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