The last educational round had the exact same as a previous Egyptian IOI Team Selection Test Qualifications problem in this group, here is the link of the original problem

Educational Round Problem: https://codeforces.com/contest/1721/problem/D

Original Problem: https://codeforces.com/group/swEqtABRxe/contest/324151/problem/C

I don't know if it is a coinidence or not.

And also Round #819 Unrated due to Problem Theft, stop stealing problems.