I will shamefully advertise myself. I think https://codeforces.com/contest/2124/problem/H and https://codeforces.com/contest/2124/problem/I are the best and hardest problems I've ever authored (and probably will be the best and hardest problems I ever will).
I will shamefully advertise myself. I think https://codeforces.com/contest/2124/problem/H and https://codeforces.com/contest/2124/problem/I are the best and hardest problems I've ever authored (and probably will be the best and hardest problems I ever will).