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Overall Editorial

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A - AtCoder Quiz 2

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

B - Yay!

• Official Editorial by nok0
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• より効率的な方法 by rsk0315

C - chess960

• Official Editorial by nok0
• Official Editorial by admin
• 楽な実装 by evima
• User Editorial by cirno3153

D - Cat

• Official Editorial by nok0
• Official Editorial by admin
• 便利な関数を使ったかんたんな実装 by nok0

E - Merge the balls

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