I got tired of solving these problems. So, I just wrote a solution that works for everything.
Swap the first and last columns
Get the elements of diagonal and antidiagonal for any m-by-n matrix
02 - Vector Variables 1
Divisible by 7
Given a square and a circle, please decide whether the square covers more area.
Lights Out 2 - 5x5, 4 moves
Fill-a-pix - Solution Checker
Rule of mixtures (composites) - other bound
Lights Out 4 - 5x5, 8 moves
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