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Consider a non-empty binary matrix M and a natural number n. For the purposes of this challenge, M is said to have blockiness n if it can be built using adjacent square blocks of size n, where each block has equal entries; and it cannot be formed using square blocks of any larger size. Intuitivel...
A rhyme scheme is the pattern of rhymes at the end of the lines in a poem. They are typically represented using letters, like ABAB. We consider two rhyme schemes identical if they are isomorphs, and therefore only report the lexicographically earliest. Equivalently, rhyme schemes are simply strin...
Convert J brackets back to 2-D list
Let's say we have a 2-D list, like the following one:
\$
\begin{bmatrix}
\color{red}{1} & \color{red}{2} & \color{red}{3} & \color{red}{4} \\
\color{blue}{5} & \color{blue}{6} & \color{blue}{7} & \color{red}{8} \\
\color{green}{9} & \color{green}{10} & \color{b...
