sir i m not getting the correct output for topological sorting in dfs.
Topological sort_dfs
this is because you have provided wrong input
g.addedge(“deep learning”,“face recongniion ai”);
g.addedge(“data set”,“face recognition ai”);
name of spelling is different
this is really fatal error in c++ it take 1/2 hr 
as i am searching mistake in dfs function 
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