D - Don't worry. Be Together Editorial by maspy

数え上げの道具「形式的べき級数」による解法の導出です。

https://maspypy.com/%e5%a4%9a%e9%a0%85%e5%bc%8f%e3%83%bb%e5%bd%a2%e5%bc%8f%e7%9a%84%e3%81%b9%e3%81%8d%e7%b4%9a%e6%95%b0%ef%bc%88%ef%bc%92%ef%bc%89%e5%bc%8f%e5%a4%89%e5%bd%a2%e3%81%ab%e3%82%88%e3%82%8b%e8%a7%a3%e6%b3%95

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