Isnt it the rule that if i dont get a question correct i wont be placed on the leaderboard?
It’s because you submitted 2 incorrect solutions for SWAPPALI , and once you submit solution to a scorable problem of your division then you are counted as a participant for that contest
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Well unfortunately, 0 score means coming last.
does this happen for long challenges also?
Yes, it does.
My bad. I started late and didn’t bothered trying other questions coz of this… 
Not really
Bro don’t think about rating if you are a beginner like many of us… from my experience I can tell you that the more you think about rating the more difficult it gets to actually get it … so just chill and try every contest for the sake of learning