Determine whether there is a non-circle to the graph, if there is a loop output

DAG\DAG.sdf
...\DAG.sln
...\DAG.v11.suo
...\DAG.vcxproj
...\DAG.vcxproj.filters
...\.ebug\CL.read.1.tlog
...\.....\CL.write.1.tlog
...\.....\DAG.exe
...\.....\DAG.ilk
...\.....\DAG.lastbuildstate
...\.....\DAG.log
...\.....\DAG.pdb
...\.....\link-cvtres.read.1.tlog
...\.....\link-cvtres.write.1.tlog
...\.....\link-rc.read.1.tlog
...\.....\link-rc.write.1.tlog
...\.....\link.8860-cvtres.read.1.tlog
...\.....\link.8860-cvtres.write.1.tlog
...\.....\link.8860-rc.read.1.tlog
...\.....\link.8860-rc.write.1.tlog
...\.....\link.8860.read.1.tlog
...\.....\link.8860.write.1.tlog
...\.....\link.read.1.tlog
...\.....\link.write.1.tlog
...\.....\vc110.idb
...\.....\vc110.pdb
...\.....\源.obj
...\源.cpp
...\Debug
DAG

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