i did 3 question last time my friend did the same but he got +200 and i got +70
Yeah, that happens when you are doing any question whether 2 or 3 make sure in how many times your all 3 questions are going correct submission.If you are doing that problem 1st time and it gives wrong and after solving that in the 2nd time your answer goes right your rank will obviously decrease. while your friend would have done all the questions in 1st attempt only.