My implementation skills are so bad it needs to be studied. I struggle to implement even the simplest solutions, even though I have the right idea in my mind. Please tell some really hard/heavy implementation problems that I can practice to get good. Thanks!
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I think yesterday's C problem was heavy implementation.
https://mirror.codeforces.com/contest/2084/problem/C
I have solved a lot of implementation based questions, but I still struggled with yesterday's C. Before starting to write code, make a basic model of how you are going to write, on a notebook (mental models doesn't really work with me). Try to use pen and paper.
You can try out 2061F1 - Kevin and Binary String (Easy Version), 2090C - Dining Hall, 2084C - You Soared Afar With Grace
There are different aspects of implementation hardness. For example something like 1661E - Narrow Components is quite a lot to type, 2092D - Mishkin Energizer is demanding in tracking off by 1 (I had submitted 8 wrong implementations), 1073E - Segment Sum is hard because you need to keep a lot in you head, but at the end code is quite compact and reasonably nice.