Count the number of occurrences of "OXO" in rows, columns, diagonals and anti-diagonals.
>> board = ['OOX'
>> board = [' O '
Increment a number, given its digits
Specific Element Count
How long is the longest prime diagonal?
Given a 4x4 matrix, swap the two middle columns
Cut an orange
Polite numbers. N-th polite number.
expand intervals vol.3
Optimum Egyptian Fractions
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