FLIPCOIN Editorial ?

I don’t find the editorial of this problem FLIPCOIN on the Codechef. If anyone has the link please share it.
Problem Link- FLIPCOIN Problem - CodeChef

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Couldn’t find Editorial,
But I think the following should help:

https://discuss.codechef.com/questions/50514/flipcoin-the-definite-topic-for-us-to-learn-segtrees

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