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Overall Editorial

• Official Editorial by ytqm3

A - Moving Piece

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B - Chmax

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C - Permutation of Length 26

• Official Editorial by Forested

D - Yet Another Balls and Boxes Problem

• Official Editorial by ytqm3

E - Output-only

• Official Editorial by ytqm3

F - Cycle and Xor

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G - 4x4

• Official Editorial by ytqm3

H - Exactly K Square Numbers

• Official Editorial by ytqm3

I - Prefix Or

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J - Balanced Permutation

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K - Inner Product

• Official Editorial by ytqm3
• User Editorial by noshi91

L - X and Xor

• Official Editorial by ytqm3