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Java (not to be confused with JavaScript) is a class-based, object-oriented, strongly typed, reflective language and run-time environment (JRE). Java programs are compiled to bytecode and run in a virtual machine (JVM) enabling a "write once, run anywhere" (WORA) methodology.

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Return the lexicographic order

You code has lots of strengths. Its main weakness is the lack of explanation for the algorithm. Why are you building the reverse graph? A reverse post order visiting of the graph is a topo sort o …
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