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Codeforces Round #861 (Div. 2) – O(log N) solution for E + full video editorial
Hello, I've made a full video editorial for the latest CF round. I'm a bit late, but I can compensate that by having a super-solution for problem E, which is faster than the authors' and also easier in my opinion.
https://www.youtube.com/watch?v=i1i_7lqnGwA
Thanks to all the authors for a cool contest!
