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Overall Editorial

• Official Editorial by admin

A - Right Triangle

• User Editorial by hamayanhamayan

B - Collatz Problem

• User Editorial by hamayanhamayan

C - Grand Garden

• より高速な解法 by MMNMM
• ユーザ解説 by drken
• User Editorial by hamayanhamayan

D - Various Sushi

• ユーザ解説 by drken