I created a video discussing DP on Trees, Expected Value and Greedy strategies to solve E. Coloring a Red Black Tree from last Codeforces Div2 round.
Video Link: https://youtu.be/EAODhN-zthA
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Yea E was good, spent 40 ish mins during contest (D1 was basically a free prob ig for anyone who was able to solve D2), cldnt come up with anything concrete. The PS sorta implied DP but cldnt really figure it out. Nice stuff....