[Counting by Formal Power Series (AtCoder JSC2019 Qualifying Problem F) | maspy’s website https://maspypy.com/%E6%95%B0%E5%AD%A6-%E5%BD%A2%E5%BC%8F%E7%9A%84%E3%81%B9%E3%81%8D% E7%B4%9A%E6%95%B0%E3%81%AB%E3%82%88%E3%82%8B%E6%95%B0%E3%81%88%E4%B8%8A%E3%81%92%EF%BC%88jsc2019%E4%BA%88%E9%81%B8%E5%95%8F%E9%A1 8Cf]

https://maspypy.com/atcoder-参加感想-2020-07-11エイシング-プログラミング-コンテ

[AtCoder G - Sum of Fibonacci numbers (square869120Contest) | maspy’s HP https://maspypy.com/atcoder-g-%e3%83%95%e3%82%a3%e3%83%9c%e3%83%8a%e 3%83%83%e3%83%81%e6%95%b0%e3%81%ae%e7%b7%8f%e5%92%8c%ef%bc%88square869120contest%ef%bc%89]


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