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siftDown(arr, n, largest); // 递归下沉
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Фото: Илья Наймушин / РИА Новости
For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.
The ad in question featured an airport security setting, with one actor explaining they were the "replacers".