Mine is 1734D - Slime Escape becuase it's nice problem and the most difficulty problem I've solved during contest. What about your?
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Mine is 1734D - Slime Escape becuase it's nice problem and the most difficulty problem I've solved during contest. What about your?
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I'm not sure. Maybe 1270E - Divide Points or 1748E - Yet Another Array Counting Problem.
Mine is Hello world problem
1852B — Imbalanced Arrays or C from the same round.
My favorite problem is case from the 5th grade OJI 2005. I think it is very useful for developing mechanical skill like taking numbers of a number and counting the digits. Also you can learn how to display information on the screen or into file from this problem so it is a nice of a programming problem from which you can learn a lot of useful information that you can later apply in other competitive problems.
EDIT: The problem is actually from 2006. I would like to apologise to all my fans for misleading them and giving them false information. I regret this negligence on my part.
My favorite problem is segment tree beats
flaaffy is not my favorite problem