1. 建堆：将数组构建成大顶堆（父节点 = 子节点）
Massage guns are often pitched at the highly active. They can help you warm up for workouts, accelerate recovery and generally keep things loose and injury-free. However, you don’t have to be training for an Ironman triathlon to benefit from a percussive pummelling. A good session can also alleviate the general soreness, stiffness and pain that comes from desk-bound days and the daily grind – all without having to cough up for a spell on a masseuse’s table or be handled by a stranger.
。关于这个话题，爱思助手下载最新版本提供了深入分析
Git packfiles use delta compression, storing only the diff when a 10MB file changes by one line, while the objects table stores each version in full. A file modified 100 times takes about 1GB in Postgres versus maybe 50MB in a packfile. Postgres does TOAST and compress large values, but that’s compressing individual objects in isolation, not delta-compressing across versions the way packfiles do, so the storage overhead is real. A delta-compression layer that periodically repacks objects within Postgres, or offloads large blobs to S3 the way LFS does, is a natural next step. For most repositories it still won’t matter since the median repo is small and disk is cheap, and GitHub’s Spokes system made a similar trade-off years ago, storing three full uncompressed copies of every repository across data centres because redundancy and operational simplicity beat storage efficiency even at hundreds of exabytes.
The cheapest option covers up to 20,000 words generated each month.
2月25日中午，国务院总理李强在北京人民大会堂同来华进行正式访问的德国总理默茨举行会谈。