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Need help with solving recurrence in problem round #140 div2 — C — Flying Saucer Segments
Here's the problem : 227C - Flying Saucer Segments
In the editorial here: http://codeforces.me/blog/entry/5378?locale=en We ended up having F(n) = 3*(F(n-1) + 1) — 1 Could somebody please elaborate on how to get we got ((3^n) — 1) from the recurrence? Sorry if this is a newbie question I'm trying to learn more on the topic.
