// 1. 建堆：从最后一个非叶子节点开始向上调整
做不做「正确的事」是一种选择，是否选择颠覆也是一种选择。
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Scott's fatal mistake was chasing nostalgia. But beyond that, Williamson's first kills here are more vicious than those in Scream. They're more on par with the graphic violence seen in the torture porn trend that would follow the release of Scream 3 — a trend that is part of the reason this franchise went fallow for 11 years.
const cur = nums[realIdx]; // 当前遍历的元素