問題追加:composition of formal power series (Large) #1113
Merged
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small_correct.cpp に元の問題の sol を入れています。
これと出力が一致していることを確認しているので、correct.cpp は信用して良いと思います。
なので、あとはコピペゆえのミスがないか等をチェックしていただけると良いと思います。
生成器もほとんどはコピペです。制約を書き換えたあと、small_correct.cpp の検証用に mid.cpp を入れました。