I joined cf recently before this i used to practice on websites like codechef, atcoder so i am pretty much skilled and even had a decent performance in the only contest i gave. However right now i was just solving problem 1A for fun and got 3 WA. I keep missing edge cases and basic things. Is this common thing which occurs to most?
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I always make many WAs because carelessness. I don't care about edge cases or penalties, solving problems is purely for amusement and AC is more than enough for me. In contests I make much fewer penalties in tensive atmosphere