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Overall Editorial

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C - Chessboard

• Official Editorial by kyopro_friends
• Official Editorial by admin

D - ABCDEFG

• Official Editorial by Nyaan
• Official 解説動画 by admin
• 楽な実装方針 by rsk0315

E - Almost Equal

• Official Editorial by PCTprobability
• Official Editorial by admin
• ハミルトン路に帰着する解法 by wasd314
• ユーザ解説 (C++ と Python の全探索コードと、別解) by drken

F - Happy New Year!

• Official Editorial by physics0523
• Official 解説放送 by editorial_admin

G - Polynomial division

• Official Editorial by mechanicalpenciI
• Official 解説放送 by editorial_admin
• User Editorial by math_hiyoko
• 実装が比較的容易な解法 by MMNMM
• ユーザ解説 by drken