This is the concerned [question][1].

The question has a negative score. 
So, it implies that the question is not  valuable/worthy of being on the site [ I obviously disagree - moreover I got the answer too].

I don't like the negative score and would like to delete the question but if the question is valuable to the site then it shouldn't be negatively voted.     


  [1]: http://cs.stackexchange.com/questions/45088/longest-simple-path-in-a-complete-graph