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- https://usaco.org/index.php?page=viewproblem2&cpid=1522
- https://codeforces.com/contest/2159/problem/B (ik there exist really similar problems that would have probably made this less fun to solve, but I didn't know any of them, so it was really nice to solve, even if I did end up getting FST even with edi sol)
- https://codeforces.com/contest/2124/problem/E