I haven't violation any rule. This is so unfair !!!

my code : https://ideone.com/gKFW9k

Mr_Frodo code :https://ideone.com/noHRhU

Tapojit047 code : https://ideone.com/Bt2BYg

these 3 codes are find similar. Although there are not same and These was problem G from last div 4 contest which very easy and standard graph problem. That's why most of the people will what is obvious. But system find it violation of the rules and warn me for blocking my account.

I was thinking to a set a problem but i got stuck making test case.