输出必须是 JSON，字段固定：
We benchmarked native WebStream pipeThrough at 630 MB/s for 1KB chunks. Node.js pipeline() with the same passthrough transform: ~7,900 MB/s. That is a 12x gap, and the difference is almost entirely Promise and object allocation overhead."，更多细节参见Line官方版本下载
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swap(&arr[0], &arr[i]); // 堆顶(最大)换到末尾