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100x speedup is achieved by comparing HH with bidirectional A*.
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Abstract:Package managers are legion. Every programming language and operating system has its own solution, each with subtly different semantics for dependency resolution. This fragmentation prevents multilingual projects from expressing precise dependencies across language ecosystems; it leaves external system and hardware dependencies implicit and unversioned; it obscures security vulnerabilities that lie in the full dependency graph. We present the \textit{Package Calculus}, a formalism for dependency resolution that unifies the core semantics of diverse package managers. Through a series of formal reductions, we show how this core is expressive enough to model the diversity that real-world package managers employ in their dependency expression languages. By using the Package Calculus as the intermediate representation of dependencies, we enable translation between distinct package managers and resolution across ecosystems.
盗窃、损坏、擅自移动使用中的其他公共交通工具设施、设备，或者以抢控驾驶操纵装置、拉扯、殴打驾驶人员等方式，干扰公共交通工具正常行驶的，处五日以下拘留或者一千元以下罚款；情节较重的，处五日以上十日以下拘留。