This a acm VS2013 written test questions, is to determine whether you can use a directed graph topological sorting. If it is topological sorting, the output sequence topology, if not, then the output a directed graph in the ring or rings.

topo\Debug\topo.exe
....\.....\topo.ilk
....\.....\topo.pdb
....\topo\Debug\topo.log
....\....\.....\topo.obj
....\....\.....\.....tlog\CL.read.1.tlog
....\....\.....\.........\CL.write.1.tlog
....\....\.....\.........\link.read.1.tlog
....\....\.....\.........\link.write.1.tlog
....\....\.....\.........\topo.lastbuildstate
....\....\.....\vc120.idb
....\....\.....\vc120.pdb
....\....\queue.h
....\....\topo.cpp
....\....\topo.vcxproj
....\....\topo.vcxproj.filters
....\topo.sdf
....\topo.sln
....\topo.v12.suo
....\....\Debug\topo.tlog
....\....\Debug
....\Debug
....\topo
topo

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