Given a 2D array of ones and zeros, generate an equivalent sized checkerboard array of ones and twos. The checkerboard pattern starts with 2:

[2,1,2,1,2;
1,2,1,2,1;
2,1,2,1,2];

Then set this checkerboard array to zero wherever the original was zero.

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Last Solution submitted on Apr 14, 2026

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