I’m not looking for "use fastio" or "use long long" advice—everyone knows that. I want the real magic.
I mean do you have tips like "in those type of problems you should think that" .
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Spectral::Cup 2026 Round 1 (Codeforces Round 1094, Div. 1 + Div. 2)
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Codeforces (c) Copyright 2010-2026 Михаил Мирзаянов
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Время на сервере: 24.04.2026 13:42:21 (h1).
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remove 1331 from your handle.
no
interactive problem = binary search
Geometry = skip
i almost got on the ioi team because of a geometry problem (where the only geometry was "reflect a point across a line") so if the geometry is simple it's actually a pretty good way to get a lot of points that most people will skip
Correct me if i´m wrong (I am not very good at this codeforces thing) but wouldn´t you just multiply the given point (X and Y) by -1 to get the inversed point across the line y=x? I´m unsure on given constraints and input formats but it seems rather simple for a question that could qualify IOI teams.
This only works for line y=x, but he probably had all type of lines