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Today I’ll talk about a trick that I learned in the Maratona de Programação Brasil group that I call the $(x + y, x - y)$ trick. This trick rotates a 2D grid by 45° and enables you to answer queries involving Manhattan distances, because after applying this transformation to... [Read More]

If you don’t know Yosupo, it’s a site for testing Competitive Programming libraries. For that, there are some problems on ranges, geometry, data structures, strings, and others. Here I’m going to talk about one problem called Range Kth Smallest, which is basically about finding the k-th element inside an interval... [Read More]

Today, I’m here to talk about a nice problem from Beecrowd called Daenerys’ Game of Trust . It’s a string and game problem, it has level 10, and at the time I’m writing this blog, only 97 out of 400 people have solved it. [Read More]

C++20/C++23 introduced new tools, and one of them is the ranges library, inspired by the well-known range-v3. This standard library made it possible to work with ranges in a way never seen before. Now you can use functions such as transform, filter, drop, take, join, and many others. All of... [Read More]

There is a problem in CSES known as Functional Graph Distribution that involves graphs and combinatorics. I solved this problem, but it was tough. I didn’t solve it at first sight, but one day I managed to solve it, and this story is about that day. To solve the problem,... [Read More]