How to do ABC342F?

Правка en1, от Sparsely, 2024-02-26 16:03:46

This problem has only Japanese editorials and Youtube videos.

People in mainland China are not allowed to visit youtube (VPN or similar is illegal) and I'm not studying Japanese (the translation is terrible), so can anyone translate or just post the written editorial here?

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en1 Английский Sparsely 2024-02-26 16:03:46 347 Initial revision (published)