Editorial for Boccher trốn tìm

Remember to use this editorial only when stuck, and not to copy-paste code from it. Please be respectful to the problem author and editorialist.
Submitting an official solution before solving the problem yourself is a bannable offence.

Chúng ta có thể duyệt qua toàn bộ hình vuông ~2 \times 2~ và kiểm tra điều kiện bài toán.


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