1. 建堆：将数组构建成大顶堆（父节点 = 子节点）
不因事小就视而不见，不因任务艰巨就退缩不前，不因目标长远就消极懈怠。
❯ ls /ostree/repo/，这一点在同城约会中也有详细论述
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At its core, a stream is just a sequence of data that arrives over time. You don't have all of it at once. You process it incrementally as it becomes available.