As 2024 nears its end, let’s share the problems we enjoyed the most this year so far! Drop the problem name, link and what made it special (optional).
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Codeforces (c) Copyright 2010-2024 Михаил Мирзаянов
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Время на сервере: 18.12.2024 20:45:30 (i1).
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2044F - Easy Demon Problem Quite an interesting problem, looked really hard but had an easy mathematical solution (Do give it a try if you haven't).
Would you mind giving some hints about it?
Think about how you could decompose the query that you have been given into parts that you can correlate with the orignal input.
1933E. Xor-Grid Problem It demonstrates the magical nature of XOR operations, completing the missing rows and columns in an array.
1919D — 01 Tree Everything fits so nicely together!
1878F - Vasilije Loves Number Theory
2029C - New Rating Although dp is easier to think here, the bin search solution is really satisfying.
1843E — Tracking Segments binary search on the prefix sum!
https://codeforces.net/contest/1931/problem/F It was such a nice thing to use cycle detection in a statement like this.
Universal Cup 3.11 O - New School Term
I enjoyed being trolled by this problem. The final observation is so natural, yet so invisible. As far as I know, some LGMs were also trolled.
1977D - XORificator never seen this trick before and thought it was unsolvable before seeing the tutorial
https://codeforces.net/problemset/problem/2042/E
ARC171E — Rookhopper's Tour
The setting feels very chaotic to me initially, but after thinking it though, it turns out there exist an elegant way to analysis the problem model very simply to make it solvable. It's just... astonishing!