I tested my code of all type of combination and it shows write answer please anyone suggest me some tricky input for Buy1Get1 problem.
this is a ‘tricky’ requirement by the way!! 
i could help you, by looking at your code… which would mean after the competition is over!
it will be difficult for me to give a generic ‘tricky’ test case!
The ‘trick’ is, you buy one, you get another similar one, absolutely free. 
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