Forgetting releaseLock() permanently breaks the stream. The locked property tells you that a stream is locked, but not why, by whom, or whether the lock is even still usable. Piping internally acquires locks, making streams unusable during pipe operations in ways that aren't obvious.
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再写代码：从插入/冒泡开始，逐步挑战快排/归并，更多细节参见雷电模拟器官方版本下载
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