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fps-24AtCoder 上的新比赛 FPS 24: 24 Problems on Formal Power Series,断断续续做了几天终于是把 W 之外的题做完了(疯狂开白是吧),发一下个人题解(
A. Snack
答案:\([x^N](x+x^3+x^4+x^6)^D\) .
B. Tuple of …
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