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Overall Editorial

• All in 2 min by evima

A - First ABC 2

• Official Editorial by en_translator

B - Prefix and Suffix

• Official Editorial by en_translator

C - Festival

• Official Editorial by en_translator

D - Polyomino

• Official Editorial by en_translator
• A solution with bit operations by Kiri8128

E - Product Development

• Official Editorial by en_translator
• A solution with bit operations by Kiri8128

F - Vacation Query

• Official Editorial by en_translator

G - Two Kinds of Base

• Official Editorial by en_translator