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[Video Tutorial] Tree Rerooting DP
source link: http://codeforces.com/blog/entry/96651
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The last contest of CodeChef (this one) had 2 rerooting problems and it wasn't really solved by many people(even in Div1), so I figured it's something not many people know.
So I have made a tutorial video on the same: https://www.youtube.com/watch?v=7_huTWwl5jM&ab_channel=CMC
In it I discuss:
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How to identify which problem requires this
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How to go about solving it
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How to implement without much hassle
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Some problems that require it and their solution/hint
When I first came up with this rerooting my implementation was pretty terrible but now it's much better IMO, so I also wanted to share it.
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